函数名 |
区别和声明 |
比较规则 |
array_diff |
值不一样就是差集 |
if (string) $elem1 === (string) $elem2 |
array_udiff |
值不一样就是差集 |
回调函数 |
array_diff_key |
键不一样就是差集 |
if (string) $elem1 === (string) $elem2 |
array_diff_ukey |
键不一样就是差集 |
回调函数 |
array_diff_assoc |
键和值都不一样是差集 |
key:if (string) $elem1 === (string) $elem2 ,value:if (string) $elem1 === (string) $elem2 |
array_diff_uassoc |
键和值都不一样是差集 |
key:if (string) $elem1 === (string) $elem2 ,value:回调函数 |
array_udiff_assoc |
键和值都不一样是差集 |
key:回调函数,value:if (string) $elem1 === (string) $elem2 |
array_udiff_uassoc |
键和值都不一样是差集 |
key:回调函数,value:回调函数 |
<?php
$array1 = array("a" => "green", "red", "blue", "red");
$array2 = array("b" => "green", "yellow", "red");
$result = array_diff($array1, $array2);
var_dump($result);
/**
array(1) {
[1] =>
string(4) "blue"
}
*/
<?php
$array1 = array('blue' => 1, 'red' => 2, 'green' => 3, 'purple' => 4);
$array2 = array('green' => 5, 'yellow' => 7, 'cyan' => 8);
$result = array_diff_key($array1, $array2);
var_dump($result);
/**
array(3) {
'blue' =>
int(1)
'red' =>
int(2)
'purple' =>
int(4)
}
*/