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')
);
$result = array();
<span xss=removed>foreach ($arr as $data) {
