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array_intersect_ukey

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

array_intersect_ukeyComputes the intersection of arrays using a callback function on the keys for comparison

Descrizione

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

array_intersect_ukey() returns an array containing all the values of array which have matching keys that are present in all the arguments.

Elenco dei parametri

array

Initial array for comparison of the arrays.

arrays

Arrays to compare keys against.

key_compare_func

La funzione di confronto deve restituire un intero minore, uguale o maggiore di zero se il primo argomento è considerato essere minore, uguale o maggiore del secondo.

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

Returning non-integer values from the comparison function, such as float, will result in an internal cast to int of the callback's return value. So values such as 0.99 and 0.1 will both be cast to an integer value of 0, which will compare such values as equal.

Valori restituiti

Returns the values of array whose keys exist in all the arguments.

Esempi

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'));
?>

Il precedente esempio visualizzerà:

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 array.

Vedere anche:

  • array_diff() - Calcola la differenza di due o più array
  • array_udiff() - Computes the difference of arrays by using a callback function for data comparison
  • array_diff_assoc() - Calcola la differenza tra array con un ulteriore controllo sull'indice
  • 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() - Calcola l'intersezione degli arrays
  • array_intersect_assoc() - Calcola l'intersezione degli array con un ulteriore controllo sugli indici
  • 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

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User Contributed Notes 1 note

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gk at anuary dot com
10 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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