PHP - sprint_r

<?php
 function sprint_r($var) {
    ob_start();
    print_r($var);
    $output=ob_get_contents();
    ob_end_clean();
    return $output;
 }
?>

<?php
 $array=array("1","2",array("3",array("4")),"5",array("6"));
 $str=sprint_r($array);
?>