Overirde

<?php

class first {
    public function something($param1) {
        return 'first-'.$param1;
    }
}

class second extends first {
    public function something($param1, $param2) {
        return 'second params=('.$param1.','.$param2.')';
    }
}

// Strict standards: Declaration of second::something() should be compatible with that of first::something() in /home/szymon/webs/wildcard/www/source/public/override.php on line 13

$myClass = new Second();
var_dump( $myClass->something(123,456) );