Compare the key names and key values of two arrays (use built-in functions to compare key names, use user-defined functions to compare key values), and return the difference:
<?phpfunction myfunction($a,$b){if ($a===$b) { return 0; } return ($a>$b)?1:-1;}$a1=array("a"=>"red","b"=>"green","c"=>"blue");$a2= array("a"=>"red","b"=> "blue","c"=>"green");$result=array_udiff_assoc($a1,$a2,"myfunction");print_r($result);?>The array_udiff() function is used to compare the key names and key values of two (or more) arrays and return the difference.
Note: This function uses built-in functions to compare key names and user-defined functions to compare key values!
This function compares the keys and values of two (or more) arrays and returns a difference array that includes all elements in the compared array ( array1 ) but not in any of the other argument arrays ( array2 or array3 etc.) in the key name and key value.
array_udiff_assoc( array1,array2,array3...,myfunction )
| parameter | describe |
|---|---|
| array1 | Required. The first array to compare with other arrays. |
| array2 | Required. The array to compare to the first array. |
| array3,... | Optional. Additional array to compare with the first array. |
| myfunction | Required. A string that defines a callable comparison function. If the first parameter <, =, > the second parameter, the corresponding comparison function must return an integer <, =, > 0. |
| Return value: | Returns a difference array that includes all keys and values that are in the compared array ( array1 ) but not in any other parameter array ( array2 or array3 , etc.). |
|---|---|
| PHP version: | 5+ |