程式設計@筆記

[php]array_intersect_key 使用key比較計算陣列的交集

(PHP 5 >= 5.1.0)

官方範例：
<?php
$array1 = array('blue'  => 1, 'red'  => 2, 'green'  => 3, 'purple' => 4);
$array2 = array('green' => 5, 'blue' => 6, 'yellow' => 7, 'cyan'   => 8);

var_dump(array_intersect_key($array1, $array2));
?>

以上例程會輸出：

array(2) {
  ["blue"]=>
  int(1)
  ["green"]=>
  int(3)
})

其它範例：

<?php
$array1 = array("green","brown","red","blue");
$array2 = array("green","brown2","blue", "red");
$result_array = array_intersect_key($array1, $array2);

print_r($result_array);
?>

以上例程會輸出：
Array ( [0] => green [1] => brown [2] => red [3] => blue )