二维关联数组转字符串

$name = array(    "self" => "wangzhengyi",    "student" => array(        "chenshan",        "xiaolingang"    ),    "unkmow" => "chaikun",    "teacher" => array(        "huangwei",        "fanwenqing"    ));

最后要获得的string格式是：

wangzhengyi,chenshan,xiaolingang,chaikun,huangwei,fanwenqing

<?php$name = array(    "self" => "wangzhengyi",    "student" => array(        "chenshan",        "xiaolingang"    ),    "unkmow" => "chaikun",    "teacher" => array(        "huangwei",        "fanwenqing"    ));function arrToStr ($array){  // 定义存储所有字符串的数组  static $r_arr = array();  if (is_array($array)) {    foreach ($array as $key => $value) {      if (is_array($value)) {        // 递归遍历        arrToStr($value);      } else {        $r_arr[] = $value;      }    }  } else if (is_string($array)) {      $r_arr[] = $array;  }  //数组去重  $r_arr = array_unique($r_arr);  $string = implode(",", $r_arr);  return $string;}echo arrToStr($name);?>