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PHP array_diff_ukey() Function
PHP array_diff_ukey() Function
PHP array_diff_ukey() Function is used to compare the keys of two or more given arrays using a user-defined function. It accepts at-least three parameters and all the three parameters are mandatory and the others are optional.It returns an array containing the entries from array1 that are not present in other given arrays.
Syntax:
array_diff_ukey($array1, $array2, $array3, ..., function);
Parameter Values
| Parameter | Description |
|---|---|
| array1 | This is a requiredparameter.This parameter definesthe array to compare from. |
| array2 | This is a requiredparameter.This parameter definesan array to compare against. |
| array3,... | This is an optionalparameter.This parameter definesmore arrays to compare against. |
| function | This is a requiredparameter.This parameter definesa string that define a callable comparison function. |
Here is an example of array_diff_ukey() function in PHP:
<html>
<body>
<pre>
<?php
function compare($x,$y)
{
if ($x===$y)
{
return 0;
}
return ($x>$y)?1:-1;
}
$x=array("a"=>"1","b"=>"2","c"=>"3","d"=>"4");
$y=array("d"=>"1","b"=>"2","e"=>"3","d"=>"3");
$result=array_diff_ukey($x,$y,"compare"); // compares only keys
print_r($result);
?>
</pre>
</body>
</html>
Output:
Array
(
[a] => 1
[c] => 3
)
Example 2:
<html>
<body>
<pre>
<?php
function compare($x,$y)
{
if ($x===$y)
{
return 0;
}
return ($x>$y)?1:-1;
}
$x=array("name"=>"Jerry","age"=>"21","place"=>"Noida","project"=>"WebApp");
$y=array("name"=>"Jerry","age"=>"19","place"=>"Noida","company"=>"Google");
$result=array_diff_ukey($x,$y,"compare"); // compares only keys.
print_r($result);
?>
</pre>
</body>
</html>
Output:
Array
(
[project] => WebApp
)
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