php實現獲取數組中相同/不相同的元素

1、獲取數組相同元素

array_intersect()該函數比較兩個（或更多個）數組的鍵值，並返回交集數組，該數組包括了所有在被比較的數組（array1）中，同時也在任何其他參數數組（array2 或 array3 等等）中的鍵值。

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

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

//Array ( [a] => red [b] => green [c] => blue )

array_intersect_assoc() 函數用於比較兩個（或更多個）數組的鍵名和鍵值，並返回交集,與 array_intersect() 函數 不同的是，本函數除了比較鍵值，還比較鍵名。返回的數組中元素的鍵名保持不變。

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

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

//Array ( [a] => red [b] => green [c] => blue )

2、獲取數組中不同元素

array_diff() 函數返回兩個數組的差集數組。該數組包括了所有在被比較的數組中，但是不在任何其他參數數組中的鍵值。在返回的數組中，鍵名保持不變。

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

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

//Array ( [d] => yellow )

array_diff_assoc() 函數用於比較兩個（或更多個）數組的鍵名和鍵值 ，並返回差集。

<?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)

 

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