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14 years ago
The following function is very useful for creating an alias of a user function. 

For built-in functions, it is less useful because default values are not available, so function aliases for built-in functions must have all parameters supplied, whether optional or not.



<?php

function create_function_alias($function_name, $alias_name)

{

    if(function_exists($alias_name))

        return false;

    $rf = new ReflectionFunction($function_name);

    $fproto = $alias_name.'(';

    $fcall = $function_name.'(';

    $need_comma = false;

    

    foreach($rf->getParameters() as $param)

    {

        if($need_comma)

        {

            $fproto .= ',';

            $fcall .= ',';

        }



        $fproto .= '$'.$param->getName();

        $fcall .= '$'.$param->getName();



        if($param->isOptional() && $param->isDefaultValueAvailable())

        {

            $val = $param->getDefaultValue();

            if(is_string($val))

                $val = "'$val'";

            $fproto .= ' = '.$val;

        }

        $need_comma = true;

    }

    $fproto .= ')';

    $fcall .= ')';



    $f = "function $fproto".PHP_EOL;

    $f .= '{return '.$fcall.';}';



    eval($f);

    return true;

}

?>
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