php多个数组是否有相同元素

array array_intersect(array $array1, array $array2, [, array $...]) 
array array_intersect_assoc(array $array1, array $array2, [, array $...])

<?php
 
$array1 = array('1', 'a' => 'aaaaaa', 'b' => 'bbbbbb', 'c');
$array2 = array('a' => 'aaaaaa', 'c' => 'bbbbbb', 'c', '1');
 
var_dump(array_intersect($array1,$array2));

array(4) {
 [0]=>
 string(1) "1"
 ["a"]=>
 string(6) "aaaaaa"
 ["b"]=>
 string(6) "bbbbbb"
 [1]=>
 string(1) "c"
}

array(1) {
 ["a"]=>
 string(6) "aaaaaa"
}