[edit] Last updated: Fri, 23 Mar 2012

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

Opis

array array_intersect_ukey ( array $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.

Parametry

array1: Initial array for comparison of the arrays.
array2: First array to compare keys against.
array: 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.

int callback ( mixed $a, mixed $b )

Zwracane wartości

Returns the values of array1 whose keys exist in all the arguments.

Przykłady

Przykład #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'));
?>

Powyższy przykład wyświetli:

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.

Zobacz też:

array_diff() - Zwraca różnice pomiędzy tablicami
array_udiff() - Computes the difference of arrays by using a callback function for data comparison
array_diff_assoc() - Oblicza różnicę między tablicami z dodatkowym sprawdzaniem kluczy
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() - Oblicza różnicę tablic używając kluczy do porównań
array_diff_ukey() - Oblicza różnicę tablic używając funkcji zwrotnej do porównywania kluczy
array_intersect() - Zwraca przecięcie tablic
array_intersect_assoc() - Wylicza przecięcie tablic z dodatkowym sprawdzaniem indeksów
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

add a note User Contributed Notes array_intersect_ukey

Fred 25-Aug-2010 04:08


Using PHP Version 5.2.9-2 on Win 32





For those wondering what happens with numeric keys, here's a short example that might save you time :





<?php


$a=array(1=>'a',2=>'b',3=>'c');


$b=array(2=>'z',3=>'c',4=>'d');


$c=array_intersect_key($a,$b);


print_r($c);


?>





Will output 


Array


(


    [2] => b


    [3] => c


)





It works fine, if values are different, the first array's ones are retained.

add a note