array_diff_assoc

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 set.

The function compares the key names and key values ​​of two (or more) arrays and returns an array of differences that include all key names and key values ​​in the array being compared ( array1 ) but not in any other parameter array ( array2 or array3 , etc.).

Example

Example 1

Compare the keys and values ​​of two arrays and return the difference:

 <?php
$a1 = array ( "a" => "red" , "b" => "green" , "c" => "blue" , ​​"d" => "yellow" ) ;
$a2 = array ( "a" => "red" , "b" => "green" , "c" => "blue" ) ;

$result = array_diff_assoc ( $a1 , $a2 ) ;
print_r ( $result ) ;
?>

Try it yourself

Example 2

Compare the keys and values ​​of two arrays and return the difference:

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

$result = array_diff_assoc ( $a1 , $a2 ) ;
print_r ( $result ) ;
?>

Try it yourself

Example 3

Compare the keys and 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" => "blue" ) ;
$a3 = array ( "h" => "red" , "b" => "green" , "g" => "blue" ) ;

$result = array_diff_assoc ( $a1 , $a2 , $a3 ) ;
print_r ( $result ) ;
?>

Try it yourself

grammar

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