Question

How can i modify returning value of built-in php function without creating new function with another name and renaming all of used functions with previous name to new one?
e.g.

function time() {
    return time()-1000;
}

Of course this won’t pass, isn’t there something like “function time() extends time() {}” or similar?

Answer 1

With the APD PECL extension you can rename and override built-in functions.

//we want to call the original, so we rename it
rename_function('time', '_time()');

//now replace the built-in time with our override
override_function('time', '', 'return my_time();');

//and here's the override
function my_time($){
        return _time()-1000;  
}

APD is intended for debugging purposes, so this isn’t a technique you should really consider for production code.