PHP compares the key names and key values of two arrays and returns the difference set of the function Array_diff_uassoc ()

Instance

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

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

Definition and usage

The ARRAY_DIFF_UASSOC () function is used to compare the key names and key values of two (or more) arrays and return a difference set.

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

The function compares the key names and key values of two (or more) arrays, and returns an array of difference sets that contain all the key names and key values in the array being compared (array1), but not in any other parameter array (array2 or array3, and so on).

Grammar

ARRAY_DIFF_UASSOC (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 difference sets that includes all the key names and key values in the array being compared (array1), but not in any other parameter array (array2 or array3, and so on).
PHP version:	5+

More examples

Example 1

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

<?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 "Red", "B" and "green", "D" and "Blue") ); $a 3=array ("e" = "Yellow", "a" and "red", "D" and "Blue"); $result =array_diff_uassoc ($a 1, $a 2, $a 3, "MyFunction") ;p Rint_r ($result);? >

Example 2

How to assign multiple arrays to the function:

<?php function MyFunction ($v 1, $v 2) {if ($v 1=== $v 2) {return 0,} if ($v 1> $v 2) {return 1,} else {return-1;}} $ A1=array (0=> "Dog",1=> "Cat",2=> "Horse"); $a 2=array (3=> "Dog",1=> "Cat",5=> "Horse"); $a 3=array (6=> "Bird",0=> "Dog",5=> "Horse"); Print_r (ARRAY_DIFF_UASSOC ($a 1, $a 2, $a 3, "MyFunction"))?>

Output:

Array ([2] = Horse)