php实现获取数组中相同/不相同的元素

1、获取数组相同元素

array_intersect()该函数比较两个（或更多个）数组的键值，并返回交集数组，该数组包括了所有在被比较的数组（array1）中，同时也在任何其他参数数组（array2 或 array3 等等）中的键值。

1 <?php
2 $a1 = array("a" => "red", "b" => "green", "c" => "blue", "d" => "yellow");
3 $a2 = array("e" => "red", "f" => "green", "g" => "blue");
4 
5 $result = array_intersect($a1, $a2);
6 print_r($result);
7 
8 //Array ( [a] => red [b] => green [c] => blue )

array_intersect_assoc() 函数用于比较两个（或更多个）数组的键名和键值，并返回交集,与 array_intersect() 函数 不同的是，本函数除了比较键值，还比较键名。返回的数组中元素的键名保持不变。

1 <?php
2 $a1 = array("a" => "red", "b" => "green", "c" => "blue", "d" => "yellow");
3 $a2 = array("a" => "red", "b" => "green", "c" => "blue");
4 
5 $result = array_intersect_assoc($a1, $a2);
6 print_r($result);
7 
8 //Array ( [a] => red [b] => green [c] => blue )

2、获取数组中不同元素

array_diff() 函数返回两个数组的差集数组。该数组包括了所有在被比较的数组中，但是不在任何其他参数数组中的键值。在返回的数组中，键名保持不变。

1 <?php
2 $a1 = array("a" => "red", "b" => "green", "c" => "blue", "d" => "yellow");
3 $a2 = array("e" => "red", "f" => "green", "g" => "blue");
4 
5 $result = array_diff($a1, $a2);
6 print_r($result);
7 
8 //Array ( [d] => yellow )

array_diff_assoc() 函数用于比较两个（或更多个）数组的键名和键值 ，并返回差集。

<?php
$a1 = array("a" => "red", "b" => "green", "c" => "blue", "d" => "yellow");
$a2 = array("a" => "red", "b" => "green", "c" => "blue");

$result = array_diff_assoc($a1, $a2);
print_r($result);

//Array([d] => yellow)

链接：https://mp.weixin.qq.com/s/62Szm_1nLXQV11VeBaeBgQ