PHP array_diff_assoc() function

Example

Compare the key names and key values ​​of two arrays and return the difference:

<?php$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");$a2=array( "a"=>"r ed","b"=>"green","c"=>"blue");$result=array_diff_assoc($a1,$a2);print_r($result);?>

Definition and usage

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

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.

grammar

 array_diff_assoc( array1,array2,array3... );

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.

technical details

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:	4.3+

More examples

Example 1

Compare the key names and key values ​​of two arrays and return the difference:

<?php$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");$a2=array( "e"=>"r ed","f"=>"green","g"=>"blue");$result=array_diff_assoc($a1,$a2);print_r($result);?>

Example 2

Compare the key names and key values ​​of three arrays and return the difference:

<?php$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");$a2=array( "a"=>"red","f"=>"green","g"=>"bl ue");$a3=array("h"=>"red","b"=>"green","g"=>"blue");$result=array_diff_assoc($a1,$a2,$a3 );print_r($result);?>