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array_diff_ukey
Computes the difference of arrays using a callback function on the keys for comparison
(PHP 5 >= 5.1.0)
array array_diff_ukey ( array array1, array array2 [, array ..., callback key_compare_func] )
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() an user supplied callback function is used for the indices comparision, not internal function.
Parameters
- array1
The array to compare from
- array2
An array to compare against
- ...
More arrays to compare against
- key_compare_func
callback function to use. The callback 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 241. 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)
}