Função explode

RaR: php explode()

	

    <?php
    /*
    "recriando a roda", função explode()
    By: Papadópolis (@papadopolis)
    */
    function _explode($op,$str,$lim = null) {
        $output = array();
        preg_match_all("/(.*?$op|.*?$)/i",$str,$vals);
        unset($vals[0],$vals[1][count($vals[1])-1]);
        foreach($vals as $ind => $val)
            foreach($val as $exe)
                $output[] = str_replace($op,"",$exe);
        if($lim !== null) {
            if($lim>=0) {
                $alg = array();
                $tmp = $output;
               
                $co = 0;
                for(;;) {
                    $alg[] = $output[$co];
                    unset($tmp[$co]);
                    if($co == $lim-1) {
                        foreach($tmp as $val)
                            $alg[$co] .= sprintf("%s%s",$op,$val);
                        break;
                    }
                    ++$co;
                }
               
                $output = $alg;
            } else {
                $f = count($output)-1;
                $l = $f-substr($lim,1);
                for(;;) {
                    unset($output[$f]);
                    --$f;
                    if($f == $l) break;
                }
            }
        }
        return $output;
    }
     
    $str = "a,e,i,o,u,1,2,3,4,5";
    $str = _explode(",",$str,3);
    print_r(array_values($str));
    ?>