PHPdefine function usage instructions. PHP pre-defined constant :__ FILE _ the script FILE name currently being processed. If it is used in an included file, its value is the included file, rather than the predefined constant in PHP:
_ FILE __
The script file name being processed. If it is used in an included file, its value is the included file, not the file name.
_ LINE __
The current number of objects being processed.
PHP_VERSION
Indicates the current version of the PHP processor, for example, '3. 0.8-Dev '.
PHP_ OS
The operating system name of the PHP processor, for example, 'Linux '.
TRUE
True Value
FALSE
False value
You can use the DEFINE function to DEFINE more constants.
For example, define constants:
<? Php
Define ("CONSTANT", "Hello world .");
Echo CONSTANT; // outputs "Hello world ."
?>
Example of _ FILE _ and _ LINE _
<? Php
Function report_error ($ file, $ line, $ message ){
Echo "An error occured in $ file on line $ line: $ message .";
}
Report_error (_ FILE __,__ LINE __, "Something went wrong! ");
?>
Script _ FILE _ the FILE name of the script being processed. If it is used in an included file, its value is the included file, not the file...
