(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
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。
array用于数组比较的初始数组。
arrays用于比较键的数组。
key_compare_func
返回 array 的值,其键名同时存在于所有参数数组中。
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。
"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) ""
}*/
?>