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    array_intersect_ukey

    (PHP 5 >= 5.1.0, PHP 7, PHP 8)

    array_intersect_ukey — 在键名上使用回调函数来比较计算数组的交集

    说明

    array_intersect_ukey(array $array, array ...$arrays, callable $key_compare_func): array

    array_intersect_ukey() 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键名的值。

    参数

    array

    用于数组比较的初始数组。

    arrays

    用于比较键的数组。

    key_compare_func

    在第一个参数小于，等于或大于第二个参数时，该比较函数必须相应地返回一个小于，等于或大于 0 的整数。

    callback(mixed $a, mixed $b): int
    警告

    从比较函数中返回非整数值，例如 float，将导致内部强制转换为 callback 返回值为 int。因此，诸如 0.99 和 0.1 之类的值都将被转换为整数值 0，将这些值比较的话将会是相等。

    返回值

    返回 array 的值，其键名同时存在于所有参数数组中。

    示例

    示例 #1 array_intersect_ukey() 例子

    <?php
    function key_compare_func($key1, $key2)
    {
    if (    $key1 == $key2)
    return     0;
    else if (    $key1 > $key2)
    return     1;
    else
    return -    1;
    }

    $array1 = array('blue' => 1, 'red' => 2, 'green' => 3, 'purple' => 4);
    $array2 = array('green' => 5, 'blue' => 6, 'yellow' => 7, 'cyan' => 8);

    var_dump(array_intersect_ukey($array1, $array2, 'key_compare_func'));
    ?>

    以上示例会输出：

    array(2) {
  ["blue"]=>
  int(1)
  ["green"]=>
  int(3)
}

    上例中可以看到，只有 'blue' 和 'green' 两个键名出现在两个数组中，因此被返回。另外注意 'blue' 和 'green' 的值在两个数组中是不同的。但因为只检查键名，因此还是匹配。返回的是 array 中的值。

    参见

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    gk at anuary dot com
    12 years ago
    "array_intersect_ukey" will not work if $key_compare_func is using regular expression to perform comparison. "_array_intersect_ukey" fully implements the "array_intersect_ukey" interface and handles properly boolean comparison. However, the native implementation should be preferred for efficiency reasons.

<?php
$key_compare_func = function ($a, $b) {
    var_dump('a=' . $a. '; b=' . $b);
    
    if (strpos($b, '/') === 0) {
        return preg_match($b, $a) > 0 ? 0 : -1;
    }
    
    if ($a == $b) {
        $weight = 0;
    } else if ($a > $b) {
        $weight = 1;
    } else {
        $weight = -1;
    }
    
    var_dump('literal comparison: ' . $weight);
    
    return $weight;
};

$foo = ['aab' => '', 'bbb' => '', 'ccb' => '', 'abb' => ''];
$bar = ['/[a-z]b[a-z]/' => ''];
$buz = ['/c[a-z][a-z]/' => ''];

echo PHP_EOL . 'array_intersect_ukey' . PHP_EOL . PHP_EOL;

$subject = array_intersect_ukey ($foo, $bar, $buz, $key_compare_func);

echo PHP_EOL;

var_dump($subject);

echo PHP_EOL . '_array_intersect_ukey' . PHP_EOL . PHP_EOL;

$subject = _array_intersect_ukey($foo, $bar, $buz, $key_compare_func);

echo PHP_EOL;

var_dump($subject);

/**
 * @author Gajus Kuizinas <gk@anuary.com>
 * @version 1.0.0 (2013 09 30)
 * @url https://gist.github.com/gajus/271ad5f36337a32a184c
 */
function _array_intersect_ukey (array $arr1, array $arr2, $key_compare_func) {
    $arr_matched = [];
    $arr_unmatched = [];
    
    $args = func_get_args();
    
    $key_compare_func = end($args);
    
    foreach ($arr1 as $k1 => $v1) {
        foreach ($arr2 as $k2 => $v2) {
            $diff = $key_compare_func($k1, $k2);
        
            //var_dump('k1=' . $k1 . ', k2=' . $k2 . ', diff=' . $diff);
            
            if ($diff === 0) {
                $arr_matched[$k1] = $v1;
            } else {
                $arr_unmatched[$k1] = $v1;
            }
        }
    }
    
    if (count($args) <= 3) {
        return $arr_matched;
    }
    
    array_splice($args, 0, 2, [$arr_unmatched]);
    
    return array_merge($arr_matched, call_user_func_array('_array_intersect_ukey', $args));
}

/*
array_intersect_ukey

string(12) "a=bbb; b=aab"
string(21) "literal comparison: 1"
string(12) "a=bbb; b=ccb"
string(22) "literal comparison: -1"
string(12) "a=abb; b=bbb"
string(22) "literal comparison: -1"
string(12) "a=aab; b=abb"
string(22) "literal comparison: -1"
string(22) "a=aab; b=/[a-z]b[a-z]/"
string(22) "a=abb; b=/[a-z]b[a-z]/"
string(22) "a=abb; b=/c[a-z][a-z]/"

array(0) {
}

_array_intersect_ukey

string(22) "a=aab; b=/[a-z]b[a-z]/"
string(22) "a=bbb; b=/[a-z]b[a-z]/"
string(22) "a=ccb; b=/[a-z]b[a-z]/"
string(22) "a=abb; b=/[a-z]b[a-z]/"
string(22) "a=aab; b=/c[a-z][a-z]/"
string(22) "a=ccb; b=/c[a-z][a-z]/"

array(3) {
  ["bbb"]=>
  string(0) ""
  ["abb"]=>
  string(0) ""
  ["ccb"]=>
  string(0) ""
}*/
?>
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