array_intersect_ukey() returns an array containing all the values of array1 which have matching keys that are present in all the arguments.
This comparison is done by a user supplied callback function. It must return an integer less than, equal to, or greater than zero if the first key is considered to be respectively less than, equal to, or greater than the second.
Initial array for comparision of the arrays.
First array to compare keys against.
Variable list of array arguments to compare keys against.
User supplied callback function to do the comparision.
function key_compare_func($key1, $key2)
if ($key1 == $key2)
else if ($key1 > $key2)
$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:
In our example you see that only the keys
'green' are present in both arrays and thus
returned. Also notice that the values for the keys
'green' differ between
the two arrays. A match still occurs because only the keys are checked.
The values returned are those of array1.