array_diff

Definition and usage

array_diff() function returns an array of differences between two arrays. This array includes all key values ​​in the array being compared but not in any other parameter array.

In the returned array, the key name remains the same.

Example

Example 1

Compare the key 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 ( $a1 , $a2 ) ;
print_r ( $result ) ;
?>

Try it yourself

Example 2

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

 <?php
$a1 = array ( "a" => "red" , "b" => "green" , "c" => "blue" , ​​"d" => "yellow" ) ;
$a2 = array ( "e" => "red" , "f" => "black" , "g" => "purple" ) ;
$a3 = array ( "a" => "red" , "b" => "black" , "h" => "yellow" ) ;

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

Try it yourself

grammar

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