PHP多维数组转一维数组的简单实现方法

$multi = array(  array(    array(      'wo',      'shi'    ),    'php'  ),  'cheng',  array(    array(      'xu',      'yuan',    )  ),  '!');$multi = arrToOne($multi);print_r($multi);function arrToOne($multi) {  $arr = array();  foreach ($multi as $key => $val) {    if( is_array($val) ) {      $arr = array_merge($arr, arrToOne($val));    } else {      $arr[] = $val;    }  }  return $arr;}

Array( [0] => wo [1] => shi [2] => php [3] => cheng [4] => xu [5] => yuan [6] => !)