Description
array
array_diff_ukey ( array array1, array array2 [, array ..., callback key_compare_func] )
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.
Example 1. array_diff_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);
$array2 = array('green' => 5, 'blue' => 6, 'yellow' => 7, 'cyan' => 8);
var_dump(array_diff_ukey($array1, $array2, 'key_compare_func'));
?>
|
The above example will output: array(2) {
["red"]=>
int(2)
["purple"]=>
int(4)
} |
|
Note:
Please note that this function only checks one dimension of a n-dimensional
array. Of course you can check deeper dimensions by using
array_diff_ukey($array1[0], $array2[0], 'callback_func');.
See also 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_key() and
array_intersect_ukey().
