Merges a two-dimensional array into a one-dimensional array.

We all know that PHP has the built-in array merging function array_merage ($ arr, $ arr1, $ arr2, $ arr3 ); then how to put a two-dimensional array such as array (Array ('A' => 1, 'B' => 2), array ('c' => 3, 'D' => 4) Merge to the following Array

Array ('A' => 1, 'B' => 2, 'c' => 3, 'D' => 4); it seems that, PHP does not currently have such built-in functions, so I wrote two methods by myself for your reference only.

First, the method is a recursive method. The Code is as follows:

<?php$newarray=array();function changearray($arr){    foreach($arr as $key=>$val){        if(is_array($val)){            changearray($val);        }else{            global $newarray;            $newarray[$key]=$val;        }    }}$arr=array(array('c'=>'d',array('d'=>'t',array('l'=>'m'))),array('e'=>'f'),'g'=>'gg','k'=>'kk');changearray($arr);print_r($newarray);

Second, the method uses a small trick, borrowed call_user_func_array ($ array ). The Code is as follows:

<?php   function merge_array($array){    return call_user_func_array('array_merge',$array);  }    $arr=array(array('a'=>1,'b'=>2,'c'=>3),array(4,5,6));  print_r(merge_array($arr));

Merges a two-dimensional array into a one-dimensional array.