Can I Redefine Built-in PHP Functions for Testing?

Redefining PHP Built-In Functions

Is it possible to redefine built-in PHP functions within a single script for testing purposes?

Answer:

Yes, it is possible using the runkit_function_redefine() function.

Code Example:

<?php
// Enable runkit internal override
ini_set('runkit.internal_override', 1);

// Redefine the time() function
runkit_function_redefine('time', 
    function () {
        return 1000; // Return a fixed value for testing
    }
);

$time = time(); // Output: 1000
echo $time;

Note:

By default, only user-defined functions can be modified. To override internal functions, you need to enable the runkit.internal_override setting in your php.ini file.

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