array_diff_ukey
(PHP 5 >= 5.1.0)
array_diff_ukey — Computes the difference of arrays using a callback function on the keys for comparison
Description
Compares the keys from array1 against the keys
from array2 and returns the difference.
This function is like array_diff() except the
comparison is done on the keys instead of the values.
Unlike array_diff_key() a user supplied callback function is used for the indices comparison, not internal function.
Parameters
-
array1 -
The array to compare from
-
array2 -
An array to compare against
-
... -
More arrays to compare 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 an array containing all the entries from
array1 that are not present in any of the other arrays.
Examples
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, $array2, 'key_compare_func'));
?>
The above example will output:
array(2) {
["red"]=>
int(2)
["purple"]=>
int(4)
}
Notes
Note:
This function only checks one dimension of a n-dimensional array. Of course you can check deeper dimensions by using array_diff_ukey($array1[0], $array2[0], 'callback_func');.
See Also
- array_diff() - 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_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
- array_intersect_ukey() - Computes the intersection of arrays using a callback function on the keys for comparison
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Коментарии
Note, also that when you are using a callback function you can use the text-placeholders as this function relies on the retval of the function you give.
So, instead of 1,0,-1 you can use TRUE and FALSE if using only two options.
Just thought it may help you