array_intersect_ukey
(PHP 5 >= 5.1.0, PHP 7, PHP 8)
Computes the intersection of arrays using a callback function on the keys for comparison
Description
array_intersect_ukey() returns an array containing all the values of array which have matching keys that are present in all the arguments.
Parameters
arrayInitial array for comparison of the arrays.
arraysArrays to compare keys against.
key_compare_funcDescription
Return Values
Returns the values of array whose keys exist in all the arguments.
Examples
array_intersect_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);
$array2 = array('green' => 5, 'blue' => 6, 'yellow' => 7, 'cyan' => 8);
var_dump(array_intersect_ukey($array1, $array2, 'key_compare_func'));
?>The above example will output:
array(2) {
["blue"]=>
int(1)
["green"]=>
int(3)
}In our example you see that only the keys 'blue' and 'green' are present in both arrays and thus returned. Also notice that the values for the keys 'blue' and 'green' differ between the two arrays. A match still occurs because only the keys are checked. The values returned are those of array.