hook functions in php

hook.php

<?php
/*
    Dirty hacks to not get into an infinite recusion when using
*/

foreach(
    ["file_put_contents", 
    "debug_backtrace", 
    "func_get_args",
    "call_user_func_array"] as $safe)
{
    runkit_function_copy($safe, $safe . "_safe");
}

function hook_log($function_name, $bt, $args, $bt_offset=2, $logging_constraints=false)
{

    if($logging_constraints && !$logging_constraints($bt, $args))
    {
        return;
    }
    
    $pwd = realpath(dirname(__FILE__)) . '/';
    $result = '';
    $result .= strftime("%d/%b/%Y %H:%M:%S:") . "\n";
    for($i = count($bt)-1 ; $i >= $bt_offset; --$i)
    {
        $curr = $bt[$i];
        if(isset($curr['file']))
        {
            $file = $curr['file'];
            $file = str_replace($pwd, '', $file);
            $result .= "$file:{$curr['line']} ";
        }
        $result .= "in {$curr['function']}():\n";
        
        if($i == $bt_offset)
        {
            $result .= "With args: " . var_export($args, true) . "\n";
        }
        elseif(isset($curr['args']))
        {
            $result .= "With args: " . var_export($curr['args'], true) . "\n";
        }
    }
    $result .= "\n-------------------------------------------------------------------------------------------\n";
    file_put_contents_safe("./calls/{$function_name}_calls.txt", $result, FILE_APPEND);

}

function create_hook($function_name, $log_constraints=false)
{
    runkit_function_copy($function_name, $function_name . '_internal');
    runkit_function_add($function_name . '_hook', 
        function() use ($function_name, $log_constraints) {
            hook_log($function_name, debug_backtrace_safe(6), func_get_args_safe(), 2, $log_constraints);
            return call_user_func_array_safe("{$function_name}_internal", func_get_args_safe());
    });
    runkit_function_redefine($function_name, '', "return call_user_func_array_safe('{$function_name}_hook',(func_get_args_safe()));");
}