PHP lets the arrays with the same values form a new array instance to explain-PHP Tutorial-php.cn

PHP lets the arrays with the same values form a new array instance to explain

jacklove

Release： 2023-04-02 10:36:01

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The editor below will share with you an article in PHP to form a new array instance with the same value in the array. It has a good reference value and I hope it will be helpful to everyone. Let’s follow the editor and take a look.

The example is as follows:

$arr = array( 
  0=>array(&#39;key1&#39;=>&#39;value1&#39; , &#39;key2&#39;=>&#39;value2&#39;), 
  1=>array(&#39;key1&#39;=>&#39;value1&#39; , &#39;key2&#39;=>&#39;value3&#39;), 
  2=>array(&#39;key1&#39;=>&#39;value2&#39; , &#39;key2&#39;=>&#39;value4&#39;), 
  999=>array(&#39;key1&#39;=>&#39;value2&#39; , &#39;key2&#39;=>&#39;value5&#39;) 
); 
 
$result = array(); 
<span style="color:#FF0000;">foreach ($arr as $data) { 
  isset($result[$data[&#39;key1&#39;]]) || $result[$data[&#39;key1&#39;]] = array(); 
  $result[$data[&#39;key1&#39;]][] = $data[&#39;key2&#39;]; 
}</span> 
ksort($cityAr, SORT_NATURAL);//这个是键值按字母先后顺序排列 
print_r($result); 
 
//输出如下 
Array 
( 
  [value1] => Array 
    ( 
      [0] => value2 
      [1] => value3 
    ) 
 
  [value2] => Array 
    ( 
      [0] => value4 
      [1] => value5 
    ) 
     
)

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