PHP -> Funkcie -> Array funkcie -> array_diff_ukey


array array_diff_ukey ( array array1, array array2 [, array ..., callback key_compare_func] )


Príkaz jazyka PHP
Computes the difference of arrays using a callback function on the keys for comparison

array_diff_ukey() returns an array containing all the values of array1 that have keys that are not present in any of the other arguments. Note that the associativity is preserved. This function is like array_diff except the comparison is done on the keys instead of the values.

This comparison is done by a user supplied callback function. It must return an integer less than, equal to, or greater than zero if the first key is considered to be respectively less than, equal to, or greater than the second.


function key_compare_func($key1, $key2)
   if ($key1 == $key2)
       return 0;
   else if ($key1 > $key2)
       return 1;
       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_diff_ukey($array1, $array2, 'key_compare_func'));

/*příklad vypíše:

array(2) {


The two keys from the key => value pairs are considered equal only if (string) $key1 === (string) $key2 . In other words a strict type check is executed so the string representation must be the same.

Poznámka: Please note that this function only checks one dimension of a n-dimensional array. Of course you can check deeper dimensions by using array_diff_ukey($array1[0], $array2[0], 'callback_func');.

Pozri aj

array_diff, array_udiff, array_diff_assoc, array_diff_uassoc, array_udiff_assoc, array_udiff_uassoc, array_diff_key, array_intersect, array_intersect_assoc, array_intersect_uassoc, array_intersect_keyarray_intersect_ukey

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