PHP's function supports passing by reference. However, default values may ONLY be passed by reference starting from PHP >= 5. Default values in PHP functions are like:
[ Hide ] // function declaration with default value
function foo($bar = 'default value here'){ ... };
// function declaration with passing by reference
function foo(&$bar){ ... };
What pissed me off is that I'm using PHP 5 for my computer but the hosting server is using PHP4. I only realize that PHP 4 doesn't supports that after I uploaded all my files to the server. Example of default values passed by reference:
[ Hide ] // This won't work in PHP < 5
function foo(&$bar = 'default value here'){ ... };
Workaround :
Set
allow_call_time_pass_reference to true in php.ini if you're using php >= 5 so that you won't get a bunch of warning messages filling your screen.
Trick to do default values passed by reference [ Hide ] <?
// function declaration
function foo($bar = 'default value here') { ... };
// function calling
foo(); // valid call
foo(&$var); // this, however is consider deprecated in PHP >= 5
?>
Base on the above code:
PHP < 5 complains:
Parse error: parse error, expecting ')' and later on by a fatal error and killing the script execution.
PHP >= 5 complains:
Warning: Call-time pass-by-reference has been deprecated - argument passed by value; If you would like to pass it by reference, modify the declaration of [runtime function name](). If you would like to enable call-time pass-by-reference, you can set allow_call_time_pass_reference to true in your INI file. However, future versions may not support this any longer.
