array_intersect_assoc

(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)

array_intersect_assoc — 带索引检查计算数组的交集

说明

array_intersect_assoc(array $array, array ...$arrays): array

array_intersect_assoc() 返回一个数组，该数组包含了所有在 array 和其它参数数组中同时存在的值。注意和 array_intersect() 不同的是，键名也用于比较。

参数

array

要检查的数组，作为主值。

arrays

要被对比的数组。

返回值

返回一个关联数组，该数组包含了所有在 array 和其它参数数组中同时存在的值。

更新日志

版本 说明
8.0.0 现在可以仅使用一个参数调用此函数。以前，至少需要两个参数。

示例

示例 #1 array_intersect_assoc() 例子

<?php
$array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");
$array2 = array("a" => "green", "b" => "yellow", "blue", "red");
$result_array = array_intersect_assoc($array1, $array2);
print_r($result_array);
?>

以上示例会输出：

Array
(
    [a] => green
)

上面例子中可以看到，只有键值对 "a" => "green" 在两个数组中都存在，从而被返回。 值 "red" 没有被返回，是因为在 $array1 中它的键名是 0 而在 $array2 中 "red" 的键名是 1，键 "b" 没有返回的原因是，它的值和其他数组不同。

仅在 (string) $elem1 === (string) $elem2 时， key => value 才被认为是相等的。 也就是说使用了严格的类型检查，字符串的表达形式必须相同。

参见

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用户贡献的备注 2 notes

up
6
Whitend
12 years ago
One of the ways to get intersection of two arrays is as follows:

<?php
function arrayIntersect( $primary_array, $secondary_array ) {

if ( !is_array( $primary_array ) || !is_array( $secondary_array ) ) {
return false;
}

if ( !empty( $primary_array ) ) {

foreach( $primary_array as $key => $value ) {

if ( !isset( $secondary_array[$key] ) ) {
unset( $primary_array[$key] );
} else {
if ( serialize( $secondary_array[$key] ) != serialize( $value ) ) {
unset( $primary_array[$key] );
}
}

}

return $primary_array;

} else {
return array();
}

}
?>

It would pay attention to both keys and values even if values would be arrays as well. One important note is that if value of $primary_array is yet another array, its order of key & value pairs becomes important for matching.
up
4
vandor at progressive dot hu
20 years ago
# ket tomb kulcs alapu metszetet szamitja ki, az erteken is ellenorzest vegez
#
# calculating (key base) intersection of arrays (value are checked)
# use: $result_array = array_intersect_assoc($a1, $a2, $a3,..);
#
##
# original code by [jochem at iamjochem dawt com] : array_diff_keys()

<?php
function array_intersect_assoc() {

$args = func_get_args();
$res = $args[0];

for ($i=1;$i<count($args);$i++) {
if (!is_array($args[$i])) {continue;}

foreach ($res as $key => $data) {
if ( (!array_key_exists($key, $args[$i])) || ( (isset($args[$i][$key])) && ($args[$i][$key] !== $res[$key]) ) ) {
unset($res[$key]);
}
}
}

return $res;
}

?>

<?php
$array1 = array("a"=>"green", "b"=>"brown", "c"=>"blue", "red");
$array2 = array("a"=>"green", "b"=>"yellow", "c"=>"yellow", "red");
$a = array('a'=>'green', 'b'=>'brown', 'c'=>'yellow');
$b = array('a'=>'green', 'b'=>'brown', 'c'=>'yellow', 'e'=>'yellow');

$result_array = array_intersect_assoc($a, $b, $array1, $array2);
?>

$args array will look like:

(
0 =>
(
a => green
b => brown
c => yellow
)

1 =>
(
a => green
b => brown
c => yellow
e => yellow
)

2 =>
(
a => green
b => brown
c => blue
0 => red
)

3 =>
(
a => green
b => yellow
c => yellow
0 => red
)

)

$result_array will look like:

(
a => green
)
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备份地址：http://www.lvesu.com/blog/php/function.array-intersect-assoc.php