Definition
The array_intersect_ukey() function compares the keys of two or more arrays and returns the matches or intersection using a user-defined key comparison function.
Syntax
array_intersect_ukey(array1, array2, array3, ..., myfunction)
Parameters
| Parameter | Description |
|---|---|
array1 |
Required. The first array is the array that the others will be compared with. |
array2 |
Required. An array to be compared with the first array. |
array3 |
Optional. An array to be compared with the first array. |
myfunction |
Required. A string that define a callable comparison function. The comparison function must return an integer <, =, or > than 0 if the first argument is <, =, or > than the second argument. |
Example
<?php
function compare($x, $y){
$x = strtolower($x);
$y = strtolower($y);
if($x == $y){
return 0;
}
return ($x < $y) ? -1 : 1;
}
$array1 = array("a" => "apple", "b" => "ball", "c" => "cat");
$array2 = array("A" => "airplane", "x" => "xylophone", "y" => "yacht");
$result = array_intersect_ukey($array1, $array2, "compare");
print_r($result);
echo "<br>";
$array3 = array("a" => "alligator", "b" => "balloon");
$result = array_intersect_ukey($array1, $array2, $array3, "strcasecmp");
print_r($result);
echo "<br>";