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

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    6
    Whitend
    13 years ago
    One of the ways to get intersection of two arrays is as follows:<?phpfunction 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.
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    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()<?phpfunction 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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