Compare the keys of two arrays and return the entries that are unique to the first array.
| <?php $a1=array(“a”=>“red”,“b”=>“green”,“c”=>“blue”); $a2=array(“a”=>“red”,“c”=>“blue”,“d”=>“pink”); $result=array_diff_key($a1,$a2); print_r($result); ?> |
The array_diff_key() function compares the keys of two or more arrays and returns an array containing entries from array1 that are not present in array2, array3, and so on.
| array_diff_key(array1, array2, array3, …) |
|
Parameter |
Description |
|
array1 |
Required. The array to use as the reference for comparison. |
|
array2 |
Required. An array to compare with. |
|
array3,… |
Optional. Additional arrays to compare with. |
|
Return Value: |
Returns an array with entries from |
|
PHP Version: |
5.1+ |
Compare the keys of two indexed arrays and return the entries that are unique to the first array.
| <?php $a1=array(“red”,“green”,“blue”,“yellow”); $a2=array(“red”,“green”,“blue”); $result=array_diff_key($a1,$a2); print_r($result); ?> |
Compare the keys of three arrays and return the entries that are unique to the first array.
| <?php $a1=array(“a”=>“red”,“b”=>“green”,“c”=>“blue”); $a2=array(“c”=>“yellow”,“d”=>“black”,“e”=>“brown”); $a3=array(“f”=>“green”,“c”=>“purple”,“g”=>“red”); $result=array_diff_key($a1,$a2,$a3); print_r($result); ?> |