PHP array_intersect_ukey() Function
What is array_intersect_ukey() Function?
Explanation
The "array_intersect_ukey()" function is used to compute the intersection of array elements using a callback function on the keys for comparison.
array_intersect_ukey(array1,array2,array3....,function)
In the above syntax values and keys of "array1" is compared with other arrays using keys and again checked in the function for keys. The values and keys are returned in a array
The difference between array_intersect_ukey() and array_intersect_key() is that array_intersect_ukey() function uses a user defined function to find the intersecting array elements using keys.
<?php
function func1($k1, $k2)
{
if ($k1 == $k2)
return 0;
else if ($k1 > $k2)
return 1;
else
return -1;
}
$a = array('blue' => 1, 'red' => 2, 'green' => 3, 'purple' => 4);
$b = array('green' => 5, 'blue' => 6, 'yellow' => 7, 'cyan'
=> 8);
var_dump(array_intersect_ukey($a, $b, 'func1'));
?> Result :
array(2) {["blue"]=> int(1) ["green"]=> int(3)}
In the above example the two arrays "$a","$b" are compared for array elements keys automatically, then compared for keys in the function. It returns intersection result of both the values and keys.
Syntax:
array_intersect_ukey(array1,array2,array3....,function)
In the above syntax values and keys of "array1" is compared with other arrays using keys and again checked in the function for keys. The values and keys are returned in a array
The difference between array_intersect_ukey() and array_intersect_key() is that array_intersect_ukey() function uses a user defined function to find the intersecting array elements using keys.
Example :
<?php
function func1($k1, $k2)
{
if ($k1 == $k2)
return 0;
else if ($k1 > $k2)
return 1;
else
return -1;
}
$a = array('blue' => 1, 'red' => 2, 'green' => 3, 'purple' => 4);
$b = array('green' => 5, 'blue' => 6, 'yellow' => 7, 'cyan'
=> 8);
var_dump(array_intersect_ukey($a, $b, 'func1'));
?>
array(2) {["blue"]=> int(1) ["green"]=> int(3)}
In the above example the two arrays "$a","$b" are compared for array elements keys automatically, then compared for keys in the function. It returns intersection result of both the values and keys.
