PHP让数组中有相同值的组成新的数组实例

实例如下所示：$arr=array(0=>array('key1'=>'value1','key2'=>'value2'),1=>array('key1'=>'value1','ke

实例如下所示：

$arr = array( 
 0=>array('key1'=>'value1' , 'key2'=>'value2'), 
 1=>array('key1'=>'value1' , 'key2'=>'value3'), 
 2=>array('key1'=>'value2' , 'key2'=>'value4'), 
 999=>array('key1'=>'value2' , 'key2'=>'value5') 
); 
 
$result = array(); 
<span style="color:#FF0000;">foreach ($arr as $data) { 
 isset($result[$data['key1']]) || $result[$data['key1']] = array(); 
 $result[$data['key1']][] = $data['key2']; 
}</span> 
ksort($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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