(PHP 5 >= 5.1.0)
array_diff_ukey — Computes the difference of arrays using a callback function on the keys for comparison
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.
array1
The array to compare from
array2
An array to compare against
...
More arrays to compare against
key_compare_func
在第一個參數小於、等於或大於第二個參數時,該比較函式必須相應地回傳一個小於、等於或大於 0 的整數。
Returns an array containing all the entries from
array1
that are not present in any of the other arrays.
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, $array2, 'key_compare_func'));
?>
上例將輸出:
array(2) { ["red"]=> int(2) ["purple"]=> int(4) }
Note:
This function only checks one dimension of a n-dimensional array. Of course you can check deeper dimensions by using array_diff_ukey($array1[0], $array2[0], 'callback_func');.