<?php

$arr = array('0'=>array("<小刚>","<小晓>","<小飞>","<小李>"),"<小红>");

function arrContentReplact($array)

{

    if(is_array($array))

    {

        foreach($array as $k => $v)

    {

        $array[$k] = arrContentReplact($array[$k]);

    }

    }else

    {

        $array = str_replace(array('小刚','小飞'),'**', $array);

    }

    return $array;

}

$arr3 = arrContentReplact($arr);

echo "<pre>";

print_r($arr3);

echo "</pre>";

?>