How to Allow Override in PHP
When you plan on using a built-in PHP function repeatedly but want to change how the function works, you can override the function and provide a different implementation. A common reason to override functions is when dealing with a variety of computer systems with different architectures or software versions. Instead of changing code in multiple spots across the script, a few lines enabling an override function can be turned on.
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Instructions
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Open your PHP source file in a text editor such as Windows Notepad.
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Declare a function to override a built-in function by adding the code "override_function('strlen', '$string', 'return override_mystrlen($string);');." The first argument, "strlen," is the function to be overridden. The second argument, "$string," is a list of arguments sent to the new function, separated by a comma. The third argument is a string that provides the new function code.
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Add the new override function by adding the code "function override_mystrlen($string) { return (1); }".
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Call the new override function by adding the code "$len = strlen('abcd');". Using the previous example, this will return the value 1.
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Save the PHP file and load it on your server.
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Tips & Warnings
PHP tags must be contained inside "<?php" and "?>" tags.
