PHP uses a user-defined function to compare the key name of the function Array_intersect_ukey ()

Instance

Compares the key names of two arrays (using a user-defined function to compare key names) and returns the intersection:

<?phpfunction myfunction ($a, $b) {if ($a = = = $b) {return 0;} return ($a > $b) 1:-1;} $a 1=array ("a" and "Red", "B" and "Green", "c" = "blue"), $a 2=array ("a" and "Blue", "B" and "Black", "e" = "Blue") $result =array_intersect_ukey ($a 1, $a 2, "MyFunction");p Rint_r ($result);? >

Definition and usage

The Array_intersect_ukey () function is used to compare the key names of two (or more) arrays and return the intersection.

Note: This function uses a user-defined function to compare key names!

The function compares the key names of two (or more) arrays and returns an array of intersections that contain all the key names in the array being compared (array1), as well as in any other parameter array (array2 or array3, and so on).

Array3, etc.

Grammar

Array_intersect_ukey (array1,array2,array3...,myfunction)

parameters	description
array1	required. The first array to compare with the other array.
array2	required. The array to compare with the first array.
array3,...	optional. The other array to compare to the first array.
myfunction	required. A string that defines the callable comparison function. If the first parameter is <, =, > The second argument, the corresponding comparison function must return an integer of < =, > 0.

Technical details

return value:	Returns an array of intersections that contain all the key names in the array being compared (array1), as well as in any other parameter array (array2 or array3, and so on).
PHP version:	5.1.0+

More examples

Example 1

Compares the key names of three arrays (using a user-defined function to compare key names) and returns the intersection:

<?phpfunction myfunction ($a, $b) {if ($a = = = $b) {return 0;} return ($a > $b) 1:-1;} $a 1=array ("a" and "Red", "b" = "green", "c" = "blue"), $a 2=array ("a" and "Black", "B" and "Yellow", "D" and "=" Brown "), $a 3=array (" e "=" purple "," f "=" white "," a "and" gold "); $result =array_intersect_ukey ($a 1, $a 2, $a 3," MyFunction ");p Rint_r ($result);?