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\' , \'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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