PEAR class and PEAR_Error class
PHP versions 4 and 5
OS_UNIX = false
OS_WINDOWS = true
PEAR_ERROR_CALLBACK = 16
PEAR_ERROR_DIE = 8
PEAR_ERROR_EXCEPTION = 32
ERROR constants
PEAR_ERROR_PRINT = 2
PEAR_ERROR_RETURN = 1
PEAR_ERROR_TRIGGER = 4
PEAR_OS = 'Windows'
void _PEAR_call_destructors( )