array_intersect_ukey
(PHP 5 >= 5.1.0)
array_intersect_ukey — Computes the intersection of arrays using a callback function on the keys for comparison
Description
$array1
, array $array2
[, array $...
], callable $key_compare_func
)
array_intersect_ukey() returns an array
containing all the values of array1
which have matching keys that are present in all the arguments.
Parameters
-
array1 -
Initial array for comparison of the arrays.
-
array2 -
First array to compare keys against.
-
... -
Variable list of array arguments to compare keys against.
-
key_compare_func -
The comparison function must return an integer less than, equal to, or greater than zero if the first argument is considered to be respectively less than, equal to, or greater than the second.
Return Values
Returns the values of array1 whose keys exist
in all the arguments.
Examples
Example #1 array_intersect_ukey() example
<?php
function key_compare_func($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'));
?>
The above example will output:
array(2) {
["blue"]=>
int(1)
["green"]=>
int(3)
}
In our example you see that only the keys 'blue'
and 'green' are present in both arrays and thus
returned. Also notice that the values for the keys
'blue' and 'green' differ between
the two arrays. A match still occurs because only the keys are checked.
The values returned are those of array1.
See Also
- array_diff() - Computes the difference of arrays
- array_udiff() - Computes the difference of arrays by using a callback function for data comparison
- array_diff_assoc() - Computes the difference of arrays with additional index check
- array_diff_uassoc() - Computes the difference of arrays with additional index check which is performed by a user supplied callback function
- array_udiff_assoc() - Computes the difference of arrays with additional index check, compares data by a callback function
- array_udiff_uassoc() - Computes the difference of arrays with additional index check, compares data and indexes by a callback function
- array_diff_key() - Computes the difference of arrays using keys for comparison
- array_diff_ukey() - Computes the difference of arrays using a callback function on the keys for comparison
- array_intersect() - Computes the intersection of arrays
- array_intersect_assoc() - Computes the intersection of arrays with additional index check
- array_intersect_uassoc() - Computes the intersection of arrays with additional index check, compares indexes by a callback function
- array_intersect_key() - Computes the intersection of arrays using keys for comparison
- PHP Руководство
- Функции по категориям
- Индекс функций
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- array_change_key_case
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- array_count_values
- array_diff_assoc
- array_diff_key
- array_diff_uassoc
- array_diff_ukey
- array_diff
- array_fill_keys
- array_fill
- array_filter
- array_flip
- array_intersect_assoc
- array_intersect_key
- array_intersect_uassoc
- array_intersect_ukey
- array_intersect
- array_key_exists
- array_keys
- array_map
- array_merge_recursive
- array_merge
- array_multisort
- array_pad
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- array_udiff_assoc
- array_udiff_uassoc
- array_udiff
- array_uintersect_assoc
- array_uintersect_uassoc
- array_uintersect
- array_unique
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Коментарии
"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) ""
}*/
?>