The array_intersect_ukey() function compares array keys, with an additional user-made function check, and returns the matches. The function returns an array containing the entries from the first array that are present in all of the other arrays.
Syntax
array_intersect_ukey(arr1, arr2, arr3, arr4, …, compare_func)
Parameters
arr1 − Array to compare from. Required.
arr2 − Array to compare against. Required.
arr3 − You can add more arrays to compare. Optional.
arr4 − You can add more arrays to compare. Optional.
compare_func − This callback function must return an integer <, =, or > than 0 if the first argument is considered to be respectively <, =, or > than the second.
Return
The array_intersect_ukey() function returns an array containing the entries from the first array that are present in all of the other arrays.
Example
The following is an example that compares the keys.
<?php
function check($a,$b) {
if ($a===$b) {
return 0;
}
return ($a>$b)?1:-1;
}
$arr1 = array("a"=>"one","b"=>"two","c"=>"three");
$arr2 = array("a"=>"one","b"=>"two");
$result = array_intersect_ukey($arr1,$arr2,"check");
print_r($result);
?>Output
Array ( [a] => one [b] => two )