Class: File_MARC_List

Structures_LinkedList_Double
   |
   --File_MARC_List

[line 74]
The File_MARC_List class extends the Structures_LinkedList_Double class to override the key() method in a meaningful way for foreach() iterators.

For the list of File_MARC_Field objects in a File_MARC_Record object, the key() method returns the tag name of the field.

For the list of File_MARC_Subfield objects in a File_MARC_Data_Field object, the key() method returns the code of the subfield.

 // Iterate through the fields in a record with key=>value iteration

 foreach ($record->getFields() as $tag=>$value) {
     print "$tag: ";
     if ($value instanceof File_MARC_Control_Field) {
         print $value->getData();
     }
     else {
         // Iterate through the subfields in this data field
         foreach ($value->getSubfields() as $code=>$subdata) {
             print "_$code";
         }
     }
     print "\n";
 }

key   [line 86]

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