【array_intersect_key】计算数组的交集,只比较键
array_intersect_key ( array $array1 , array $array2 [, array $... ] ) : array
- 比较采用规则:if (string) $elem1 === (string) $elem2
<?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));
/*
array(2) {
["blue"]=>
int(1)
["green"]=>
int(3)
}
*/