PHP array_diff_ukey() function
Syntax
PHP array_diff_ukey() function has the following syntax.
array_diff_ukey(array1,array2,array3...,myfunction);Definition
The array_diff_ukey() function compares the keys of two or more arrays with a user-defined function, and returns an array that contains the entries from array1 that are not present in array2 or array3, etc.
Parameter
| Parameter | Is Required | Description |
|---|---|---|
| array1 | Required. | The array to compare from |
| array2 | Required. | An array to compare against |
| array3,... | Optional. | More arrays to compare against |
| 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
Compare the keys of two arrays using a user-defined key comparison function, and return the differences:
<?php/*from www.j a v a2s . c om*/
function myfunction($a,$b){
if ($a===$b){
return 0;
}
return ($a>$b)?1:-1;
}
$a1=array("a"=>"A","b"=>"B","c"=>"C","j"=>"java2s.com");
$a2=array("a"=>"A","b"=>"B","e"=>"E");
$result=array_diff_ukey($a1,$a2,"myfunction");
print_r($result);
?>
The code above generates the following result.
