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Classes:
MDB2
MDB2_BufferedIterator
MDB2_Date
MDB2_Driver_Common
MDB2_Driver_Datatype_Common
MDB2_Driver_Function_Common
MDB2_Driver_Manager_Common
MDB2_Driver_Native_Common
MDB2_Driver_Reverse_Common
MDB2_Error
MDB2_Extended
MDB2_Iterator
MDB2_LOB
MDB2_Module_Common
MDB2_Result
MDB2_Result_Common
MDB2_Row
MDB2_Statement_Common
Files:
Common.php
Common.php
Common.php
Common.php
Common.php
Date.php
example.php
Extended.php
Iterator.php
LOB.php
MDB2.php

Class: MDB2_Driver_Datatype_Common

Source Location: /MDB2-2.5.0b1/MDB2/Driver/Datatype/Common.php

Class Overview

MDB2_Module_Common
   |
   --MDB2_Driver_Datatype_Common

MDB2_Driver_Common: Base class that is extended by each MDB2 driver


Author(s):

Variables

Methods

Inherited Variables

Class: MDB2_Module_Common

MDB2_Module_Common::$db_index

Inherited Methods

Class: MDB2_Module_Common

MDB2_Module_Common::__construct()
Constructor
MDB2_Module_Common::MDB2_Module_Common()
PHP 4 Constructor
MDB2_Module_Common::getDBInstance()
Get the instance of MDB2 associated with the module instance

Class Details

[line 65]
MDB2_Driver_Common: Base class that is extended by each MDB2 driver

To load this module in the MDB2 object: $mdb->loadModule('Datatype');



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Class Variables

$lobs = array()

[line 85]

contains all LOB objects created with this MDB2 instance
  • Access: protected

Type:   array


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$valid_default_values = array(
        'text'      => '',
        'boolean'   => true,
        'integer'   => 0,
        'decimal'   => 0.0,
        'float'     => 0.0,
        'timestamp' => '1970-01-01 00:00:00',
        'time'      => '00:00:00',
        'date'      => '1970-01-01',
        'clob'      => '',
        'blob'      => '',
    )

[line 67]


Type:   mixed


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Method Detail

checkResultTypes   [line 143]

mixed checkResultTypes( array $types)

Define the list of types to be associated with the columns of a given result set.

This function may be called before invoking fetchRow(), fetchOne() fetchCole() and fetchAll() so that the necessary data type conversions are performed on the data to be retrieved by them. If this function is not called, the type of all result set columns is assumed to be text, thus leading to not perform any conversions.

  • Return: MDB2_OK on success, a MDB2 error on failure
  • Access: public

Parameters:

array   $types   —  array variable that lists the data types to be expected in the result set columns. If this array contains less types than the number of columns that are returned in the result set, the remaining columns are assumed to be of the type text. Currently, the types clob and blob are not fully supported.

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compareDefinition   [line 873]

array compareDefinition( array $current, array $previous)

Obtain an array of changes that may need to applied
  • Return: containing all changes that will need to be applied
  • Access: public

Parameters:

array   $current   —  new definition
array   $previous   —  old definition

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convertResult   [line 233]

mixed convertResult( mixed $value, string $type, [boolean $rtrim = true])

Convert a value to a RDBMS indipendent MDB2 type
  • Return: converted value
  • Access: public

Parameters:

mixed   $value   —  value to be converted
string   $type   —  specifies which type to convert to
boolean   $rtrim   —  [optional] when TRUE [default], apply rtrim() to text

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convertResultRow   [line 264]

mixed convertResultRow( array $types, array $row, [boolean $rtrim = true])

Convert a result row
  • Return: MDB2_OK on success, an MDB2 error on failure
  • Access: public

Parameters:

array   $types   — 
array   $row   —  specifies the types to convert to
boolean   $rtrim   —  [optional] when TRUE [default], apply rtrim() to text

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destroyLOB   [line 1611]

void destroyLOB( resource $lob)

Free any resources allocated during the lifetime of the large object handler object.
  • Access: public

Parameters:

resource   $lob   —  stream handle

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getDeclaration   [line 339]

string getDeclaration( string $type, string $name, string $field)

Obtain DBMS specific SQL code portion needed to declare of the given type
  • Return: DBMS specific SQL code portion that should be used to declare the specified field.
  • Access: public

Parameters:

string   $type   —  type to which the value should be converted to
string   $name   —  name the field to be declared.
string   $field   —  definition of the field

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getTypeDeclaration   [line 388]

string getTypeDeclaration( array $field)

Obtain DBMS specific SQL code portion needed to declare an text type field to be used in statements like CREATE TABLE.
  • Return: DBMS specific SQL code portion that should be used to declare the specified field.
  • Access: public

Parameters:

array   $field   — 

associative array with the name of the properties of the field being declared as array indexes. Currently, the types of supported field properties are as follows:

length Integer value that determines the maximum length of the text field. If this argument is missing the field should be declared to have the longest length allowed by the DBMS.

default Text value to be used as default for this field.

notnull Boolean flag that indicates whether this field is constrained to not be set to null.

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getValidTypes   [line 100]

mixed getValidTypes( )

Get the list of valid types

This function returns an array of valid types as keys with the values being possible default values for all native datatypes and mapped types for custom datatypes.

  • Return: array on success, a MDB2 error on failure
  • Access: public

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implodeArray   [line 1652]

string implodeArray( array $array, [string $type = false])

apply a type to all values of an array and return as a comma seperated string useful for generating IN statements
  • Return: comma seperated values
  • Access: public

Parameters:

array   $array   —  data array
string   $type   —  determines type of the field

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mapNativeDatatype   [line 1756]

array mapNativeDatatype( array $field)

Maps a native array description of a field to a MDB2 datatype and length
  • Return: containing the various possible types, length, sign, fixed
  • Access: public

Parameters:

array   $field   —  native field description

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mapPrepareDatatype   [line 1806]

string mapPrepareDatatype( string $type)

Maps an mdb2 datatype to mysqli prepare type
  • Access: public

Parameters:

string   $type   — 

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matchPattern   [line 1682]

string matchPattern( array $pattern, [string $operator = null], [string $field = null])

build a pattern matching string
  • Return: SQL pattern
  • Access: public

Parameters:

array   $pattern   —  even keys are strings, odd are patterns (% and _)
string   $operator   —  optional pattern operator (LIKE, ILIKE and maybe others in the future)
string   $field   —  optional field name that is being matched against (might be required when emulating ILIKE)

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patternEscapeString   [line 1741]

string patternEscapeString( )

build string to define pattern escape character
  • Return: define pattern escape character
  • Access: public

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quote   [line 1115]

string quote( string $value, [string $type = null], [bool $quote = true], [bool $escape_wildcards = false])

Convert a text value into a DBMS specific format that is suitable to compose query statements.
  • Return: text string that represents the given argument value in a DBMS specific format.
  • Access: public

Parameters:

string   $value   —  text string value that is intended to be converted.
string   $type   —  type to which the value should be converted to
bool   $quote   —  determines if the value should be quoted and escaped
bool   $escape_wildcards   —  if to escape escape wildcards

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writeLOBToFile   [line 1518]

mixed writeLOBToFile( resource $lob, string $file)

retrieve LOB from the database
  • Return: MDB2_OK on success, a MDB2 error on failure
  • Access: protected

Parameters:

resource   $lob   —  stream handle
string   $file   —  name of the file into which the LOb should be fetched

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_baseConvertResult   [line 173]

object an _baseConvertResult( mixed $value, string $type, [boolean $rtrim = true])

General type conversion method
  • Return: MDB2 error on failure
  • Access: protected

Parameters:

mixed   $value   —  reference to a value to be converted
string   $type   —  specifies which type to convert to
boolean   $rtrim   —  [optional] when TRUE [default], apply rtrim() to text

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_compareBLOBDefinition   [line 999]

array _compareBLOBDefinition( array $current, array $previous)

Obtain an array of changes that may need to applied to an BLOB field
  • Return: containing all changes that will need to be applied
  • Access: protected

Parameters:

array   $current   —  new definition
array   $previous   —  old definition

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_compareBooleanDefinition   [line 1063]

array _compareBooleanDefinition( array $current, array $previous)

Obtain an array of changes that may need to applied to an boolean field
  • Return: containing all changes that will need to be applied
  • Access: protected

Parameters:

array   $current   —  new definition
array   $previous   —  old definition

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_compareCLOBDefinition   [line 983]

array _compareCLOBDefinition( array $current, array $previous)

Obtain an array of changes that may need to applied to an CLOB field
  • Return: containing all changes that will need to be applied
  • Access: protected

Parameters:

array   $current   —  new definition
array   $previous   —  old definition

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_compareDateDefinition   [line 1015]

array _compareDateDefinition( array $current, array $previous)

Obtain an array of changes that may need to applied to an date field
  • Return: containing all changes that will need to be applied
  • Access: protected

Parameters:

array   $current   —  new definition
array   $previous   —  old definition

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_compareDecimalDefinition   [line 1095]

array _compareDecimalDefinition( array $current, array $previous)

Obtain an array of changes that may need to applied to an decimal field
  • Return: containing all changes that will need to be applied
  • Access: protected

Parameters:

array   $current   —  new definition
array   $previous   —  old definition

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_compareFloatDefinition   [line 1079]

array _compareFloatDefinition( array $current, array $previous)

Obtain an array of changes that may need to applied to an float field
  • Return: containing all changes that will need to be applied
  • Access: protected

Parameters:

array   $current   —  new definition
array   $previous   —  old definition

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_compareIntegerDefinition   [line 929]

array _compareIntegerDefinition( array $current, array $previous)

Obtain an array of changes that may need to applied to an integer field
  • Return: containing all changes that will need to be applied
  • Access: protected

Parameters:

array   $current   —  new definition
array   $previous   —  old definition

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_compareTextDefinition   [line 956]

array _compareTextDefinition( array $current, array $previous)

Obtain an array of changes that may need to applied to an text field
  • Return: containing all changes that will need to be applied
  • Access: protected

Parameters:

array   $current   —  new definition
array   $previous   —  old definition

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_compareTimeDefinition   [line 1031]

array _compareTimeDefinition( array $current, array $previous)

Obtain an array of changes that may need to applied to an time field
  • Return: containing all changes that will need to be applied
  • Access: protected

Parameters:

array   $current   —  new definition
array   $previous   —  old definition

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_compareTimestampDefinition   [line 1047]

array _compareTimestampDefinition( array $current, array $previous)

Obtain an array of changes that may need to applied to an timestamp field
  • Return: containing all changes that will need to be applied
  • Access: protected

Parameters:

array   $current   —  new definition
array   $previous   —  old definition

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_endOfLOB   [line 1596]

mixed _endOfLOB( array $lob)

Determine whether it was reached the end of the large object and therefore there is no more data to be read for the its input stream.
  • Return: true or false on success, a MDB2 error on failure
  • Access: protected

Parameters:

array   $lob   —  array

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_getBLOBDeclaration   [line 688]

string _getBLOBDeclaration( string $name, array $field)

Obtain DBMS specific SQL code portion needed to declare an binary large object type field to be used in statements like CREATE TABLE.
  • Return: DBMS specific SQL code portion that should be used to declare the specified field.
  • Access: protected

Parameters:

string   $name   —  name the field to be declared.
array   $field   — 

associative array with the name of the properties of the field being declared as array indexes. Currently, the types of supported field properties are as follows:

length Integer value that determines the maximum length of the large object field. If this argument is missing the field should be declared to have the longest length allowed by the DBMS.

notnull Boolean flag that indicates whether this field is constrained to not be set to null.

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_getBooleanDeclaration   [line 722]

string _getBooleanDeclaration( string $name, array $field)

Obtain DBMS specific SQL code portion needed to declare a boolean type field to be used in statements like CREATE TABLE.
  • Return: DBMS specific SQL code portion that should be used to declare the specified field.
  • Access: protected

Parameters:

string   $name   —  name the field to be declared.
array   $field   — 

associative array with the name of the properties of the field being declared as array indexes. Currently, the types of supported field properties are as follows:

default Boolean value to be used as default for this field.

notnullL Boolean flag that indicates whether this field is constrained to not be set to null.

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_getCLOBDeclaration   [line 652]

string _getCLOBDeclaration( string $name, array $field)

Obtain DBMS specific SQL code portion needed to declare an character large object type field to be used in statements like CREATE TABLE.
  • Return: DBMS specific SQL code portion that should be used to declare the specified field.
  • Access: public

Parameters:

string   $name   —  name the field to be declared.
array   $field   — 

associative array with the name of the properties of the field being declared as array indexes. Currently, the types of supported field properties are as follows:

length Integer value that determines the maximum length of the large object field. If this argument is missing the field should be declared to have the longest length allowed by the DBMS.

notnull Boolean flag that indicates whether this field is constrained to not be set to null.

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_getDateDeclaration   [line 749]

string _getDateDeclaration( string $name, array $field)

Obtain DBMS specific SQL code portion needed to declare a date type field to be used in statements like CREATE TABLE.
  • Return: DBMS specific SQL code portion that should be used to declare the specified field.
  • Access: protected

Parameters:

string   $name   —  name the field to be declared.
array   $field   — 

associative array with the name of the properties of the field being declared as array indexes. Currently, the types of supported field properties are as follows:

default Date value to be used as default for this field.

notnull Boolean flag that indicates whether this field is constrained to not be set to null.

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_getDecimalDeclaration   [line 857]

string _getDecimalDeclaration( string $name, array $field)

Obtain DBMS specific SQL code portion needed to declare a decimal type field to be used in statements like CREATE TABLE.
  • Return: DBMS specific SQL code portion that should be used to declare the specified field.
  • Access: protected

Parameters:

string   $name   —  name the field to be declared.
array   $field   — 

associative array with the name of the properties of the field being declared as array indexes. Currently, the types of supported field properties are as follows:

default Decimal value to be used as default for this field.

notnull Boolean flag that indicates whether this field is constrained to not be set to null.

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_getDeclaration   [line 454]

string _getDeclaration( string $name, array $field)

Obtain DBMS specific SQL code portion needed to declare a generic type field to be used in statements like CREATE TABLE.
  • Return: DBMS specific SQL code portion that should be used to declare the specified field, or a MDB2_Error on failure
  • Access: protected

Parameters:

string   $name   —  name the field to be declared.
array   $field   — 

associative array with the name of the properties of the field being declared as array indexes. Currently, the types of supported field properties are as follows:

length Integer value that determines the maximum length of the text field. If this argument is missing the field should be declared to have the longest length allowed by the DBMS.

default Text value to be used as default for this field.

notnull Boolean flag that indicates whether this field is constrained to not be set to null. charset Text value with the default CHARACTER SET for this field. collation Text value with the default COLLATION for this field.

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_getDeclarationOptions   [line 495]

string _getDeclarationOptions( array $field)

Obtain DBMS specific SQL code portion needed to declare a generic type field to be used in statement like CREATE TABLE, without the field name and type values (ie. just the character set, default value, if the field is permitted to be NULL or not, and the collation options).
  • Return: DBMS specific SQL code portion that should be used to declare the specified field's options.
  • Access: protected

Parameters:

array   $field   — 

associative array with the name of the properties of the field being declared as array indexes. Currently, the types of supported field properties are as follows:

default Text value to be used as default for this field. notnull Boolean flag that indicates whether this field is constrained to not be set to null. charset Text value with the default CHARACTER SET for this field. collation Text value with the default COLLATION for this field.

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_getFloatDeclaration   [line 830]

string _getFloatDeclaration( string $name, array $field)

Obtain DBMS specific SQL code portion needed to declare a float type field to be used in statements like CREATE TABLE.
  • Return: DBMS specific SQL code portion that should be used to declare the specified field.
  • Access: protected

Parameters:

string   $name   —  name the field to be declared.
array   $field   — 

associative array with the name of the properties of the field being declared as array indexes. Currently, the types of supported field properties are as follows:

default Float value to be used as default for this field.

notnull Boolean flag that indicates whether this field is constrained to not be set to null.

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_getIntegerDeclaration   [line 583]

string _getIntegerDeclaration( string $name, array $field)

Obtain DBMS specific SQL code portion needed to declare an integer type field to be used in statements like CREATE TABLE.
  • Return: DBMS specific SQL code portion that should be used to declare the specified field.
  • Access: protected

Parameters:

string   $name   —  name the field to be declared.
array   $field   — 

associative array with the name of the properties of the field being declared as array indexes. Currently, the types of supported field properties are as follows:

unsigned Boolean flag that indicates whether the field should be declared as unsigned integer if possible.

default Integer value to be used as default for this field.

notnull Boolean flag that indicates whether this field is constrained to not be set to null.

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_getTextDeclaration   [line 623]

string _getTextDeclaration( string $name, array $field)

Obtain DBMS specific SQL code portion needed to declare an text type field to be used in statements like CREATE TABLE.
  • Return: DBMS specific SQL code portion that should be used to declare the specified field.
  • Access: protected

Parameters:

string   $name   —  name the field to be declared.
array   $field   — 

associative array with the name of the properties of the field being declared as array indexes. Currently, the types of supported field properties are as follows:

length Integer value that determines the maximum length of the text field. If this argument is missing the field should be declared to have the longest length allowed by the DBMS.

default Text value to be used as default for this field.

notnull Boolean flag that indicates whether this field is constrained to not be set to null.

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_getTimeDeclaration   [line 803]

string _getTimeDeclaration( string $name, array $field)

Obtain DBMS specific SQL code portion needed to declare a time field to be used in statements like CREATE TABLE.
  • Return: DBMS specific SQL code portion that should be used to declare the specified field.
  • Access: protected

Parameters:

string   $name   —  name the field to be declared.
array   $field   — 

associative array with the name of the properties of the field being declared as array indexes. Currently, the types of supported field properties are as follows:

default Time value to be used as default for this field.

notnull Boolean flag that indicates whether this field is constrained to not be set to null.

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_getTimestampDeclaration   [line 776]

string _getTimestampDeclaration( string $name, array $field)

Obtain DBMS specific SQL code portion needed to declare a timestamp field to be used in statements like CREATE TABLE.
  • Return: DBMS specific SQL code portion that should be used to declare the specified field.
  • Access: protected

Parameters:

string   $name   —  name the field to be declared.
array   $field   — 

associative array with the name of the properties of the field being declared as array indexes. Currently, the types of supported field properties are as follows:

default Timestamp value to be used as default for this field.

notnull Boolean flag that indicates whether this field is constrained to not be set to null.

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_mapNativeDatatype   [line 1785]

array _mapNativeDatatype( array $field)

Maps a native array description of a field to a MDB2 datatype and length
  • Return: containing the various possible types, length, sign, fixed
  • Access: public

Parameters:

array   $field   —  native field description

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_quoteBLOB   [line 1331]

string _quoteBLOB( string $value, bool $quote, bool $escape_wildcards)

Convert a text value into a DBMS specific format that is suitable to compose query statements.
  • Return: text string that represents the given argument value in a DBMS specific format.
  • Access: protected

Parameters:

string   $value   —  text string value that is intended to be converted.
bool   $quote   —  determines if the value should be quoted and escaped
bool   $escape_wildcards   —  if to escape escape wildcards

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_quoteBoolean   [line 1350]

string _quoteBoolean( string $value, bool $quote, bool $escape_wildcards)

Convert a text value into a DBMS specific format that is suitable to compose query statements.
  • Return: text string that represents the given argument value in a DBMS specific format.
  • Access: protected

Parameters:

string   $value   —  text string value that is intended to be converted.
bool   $quote   —  determines if the value should be quoted and escaped
bool   $escape_wildcards   —  if to escape escape wildcards

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_quoteCLOB   [line 1312]

string _quoteCLOB( string $value, bool $quote, bool $escape_wildcards)

Convert a text value into a DBMS specific format that is suitable to compose query statements.
  • Return: text string that represents the given argument value in a DBMS specific format.
  • Access: protected

Parameters:

string   $value   —  text string value that is intended to be converted.
bool   $quote   —  determines if the value should be quoted and escaped
bool   $escape_wildcards   —  if to escape escape wildcards

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_quoteDate   [line 1369]

string _quoteDate( string $value, bool $quote, bool $escape_wildcards)

Convert a text value into a DBMS specific format that is suitable to compose query statements.
  • Return: text string that represents the given argument value in a DBMS specific format.
  • Access: protected

Parameters:

string   $value   —  text string value that is intended to be converted.
bool   $quote   —  determines if the value should be quoted and escaped
bool   $escape_wildcards   —  if to escape escape wildcards

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_quoteDecimal   [line 1483]

string _quoteDecimal( string $value, bool $quote, bool $escape_wildcards)

Convert a text value into a DBMS specific format that is suitable to compose query statements.
  • Return: text string that represents the given argument value in a DBMS specific format.
  • Access: protected

Parameters:

string   $value   —  text string value that is intended to be converted.
bool   $quote   —  determines if the value should be quoted and escaped
bool   $escape_wildcards   —  if to escape escape wildcards

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_quoteFloat   [line 1456]

string _quoteFloat( string $value, bool $quote, bool $escape_wildcards)

Convert a text value into a DBMS specific format that is suitable to compose query statements.
  • Return: text string that represents the given argument value in a DBMS specific format.
  • Access: protected

Parameters:

string   $value   —  text string value that is intended to be converted.
bool   $quote   —  determines if the value should be quoted and escaped
bool   $escape_wildcards   —  if to escape escape wildcards

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_quoteInteger   [line 1196]

string _quoteInteger( string $value, bool $quote, bool $escape_wildcards)

Convert a text value into a DBMS specific format that is suitable to compose query statements.
  • Return: text string that represents the given argument value in a DBMS specific format.
  • Access: protected

Parameters:

string   $value   —  text string value that is intended to be converted.
bool   $quote   —  determines if the value should be quoted and escaped
bool   $escape_wildcards   —  if to escape escape wildcards

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_quoteLOB   [line 1289]

string _quoteLOB( string $value, bool $quote, bool $escape_wildcards)

Convert a text value into a DBMS specific format that is suitable to compose query statements.
  • Return: text string that represents the given argument value in a DBMS specific format.
  • Access: protected

Parameters:

string   $value   —  text string value that is intended to be converted.
bool   $quote   —  determines if the value should be quoted and escaped
bool   $escape_wildcards   —  if to escape escape wildcards

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_quoteText   [line 1215]

string _quoteText( string $value, bool $quote, bool $escape_wildcards)

Convert a text value into a DBMS specific format that is suitable to compose query statements.
  • Return: text string that already contains any DBMS specific escaped character sequences.
  • Access: protected

Parameters:

string   $value   —  text string value that is intended to be converted.
bool   $quote   —  determines if the value should be quoted and escaped
bool   $escape_wildcards   —  if to escape escape wildcards

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_quoteTime   [line 1427]

string _quoteTime( string $value, bool $quote, bool $escape_wildcards)

Convert a text value into a DBMS specific format that is suitable to compose query statements.
  • Return: text string that represents the given argument value in a DBMS specific format.
  • Access: protected

Parameters:

string   $value   —  text string value that is intended to be converted.
bool   $quote   —  determines if the value should be quoted and escaped
bool   $escape_wildcards   —  if to escape escape wildcards

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_quoteTimestamp   [line 1398]

string _quoteTimestamp( string $value, bool $quote, bool $escape_wildcards)

Convert a text value into a DBMS specific format that is suitable to compose query statements.
  • Return: text string that represents the given argument value in a DBMS specific format.
  • Access: protected

Parameters:

string   $value   —  text string value that is intended to be converted.
bool   $quote   —  determines if the value should be quoted and escaped
bool   $escape_wildcards   —  if to escape escape wildcards

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_readFile   [line 1245]

string _readFile( string $value)

Convert a text value into a DBMS specific format that is suitable to compose query statements.
  • Return: text string that represents the given argument value in a DBMS specific format.
  • Access: protected

Parameters:

string   $value   —  text string value that is intended to be converted.

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_readLOB   [line 1580]

mixed _readLOB( resource $lob, integer $length, string $data)

Read data from large object input stream.
  • Return: the effective number of bytes read from the large object input stream on sucess or an MDB2 error object.
  • See: endOfLOB()
  • Access: public

Parameters:

resource   $lob   —  stream handle
string   $data   —  reference to a variable that will hold data to be read from the large object input stream
integer   $length   —  value that indicates the largest ammount ofdata to be read from the large object input stream.

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_retrieveLOB   [line 1555]

mixed _retrieveLOB( &$lob, array $lob)

retrieve LOB from the database
  • Return: MDB2_OK on success, a MDB2 error on failure
  • Access: protected

Parameters:

array   $lob   —  array
   &$lob   — 

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_sortResultFieldTypes   [line 292]

mixed _sortResultFieldTypes( $columns, array $types, array $row, bool $rtrim)

convert a result row
  • Return: MDB2_OK on success, a MDB2 error on failure
  • Access: public

Parameters:

array   $types   — 
array   $row   —  specifies the types to convert to
bool   $rtrim   —  if to rtrim text values or not
   $columns   — 

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Documentation generated on Mon, 11 Mar 2019 15:17:17 -0400 by phpDocumentor 1.4.4. PEAR Logo Copyright © PHP Group 2004.