Compare the keys of two arrays using a user-defined function to compare the keys, and return the matching entries.
| <?php function myfunction($a,$b) { if ($a===$b) { return 0; } return ($a>$b)?1:-1; } $a1=array(“a”=>“red”,“b”=>“green”,“c”=>“blue”); $a2=array(“a”=>“blue”,“b”=>“black”,“e”=>“blue”); $result=array_intersect_ukey($a1,$a2,“myfunction”); print_r($result); ?> |
The array_intersect_ukey() function compares the keys of two or more arrays and returns the matches.
Note: This function uses a user-defined function for key comparison.
It returns an array containing entries from array1 that are also present in array2, array3, and so on.
| array_intersect_ukey(array1, array2, array3, …, myfunction) |
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Parameter |
Description |
|
array1 |
Required. The first array serves as the reference for comparison with the other arrays. |
|
array2 |
Required. An array to compare against the first array. |
|
array3,… |
Optional. Additional arrays to compare with the first array. |
|
myfunction |
Required. A string specifying a callable comparison function. This function must return an integer less than, equal to, or greater than 0 depending on whether the first argument is less than, equal to, or greater than the second argument. |
|
Return Value: |
Returns an array with entries from |
|
PHP Version: |
5.1.0+ |
Compare the keys of three arrays using a user-defined function for key comparison, and return the matching entries.
| <?php function myfunction($a,$b) { if ($a===$b) { return 0; } return ($a>$b)?1:-1; } $a1=array(“a”=>“red”,“b”=>“green”,“c”=>“blue”); $a2=array(“a”=>“black”,“b”=>“yellow”,“d”=>“brown”); $a3=array(“e”=>“purple”,“f”=>“white”,“a”=>“gold”); $result=array_intersect_ukey($a1,$a2,$a3,“myfunction”); print_r($result); ?> |