PHP array_diff_assoc() Function

Hello folks! welcome back to a new edition of our tutorial on PHP. In this tutorial guide, we are going to be studying about the PHP array_diff_assoc() Function.

The built-in array_diff_assoc() function in PHP compares the keys and values of two or more arrays and returns the difference.

This PHP function compares the keys and values of two or more arrays and returns an array containing the entries from array1 but are not present in array2 or array3, etc.

This function is different from array_diff() function because array_diff() function uses only values to compare with other arrays whereas array_diff_assoc() function makes use of keys and values for comparing with other arrays.

Syntax

Following below is the syntax to use this function -

array array_diff_assoc( array $array1, array $array2 [, array $array3...] );

READ: PHP array_diff() Function

Parameter Details

Sr.No	Parameter & Description
1	array1 (Required) It is an array to compare from
2	array2 (Required) It is an array to be compared with the first array
3	array3 (Optional) It is an array to be compared with the first array

Return Value

This built-in PHP function returns an array containing the values from array1 that are not available in other arrays with the same keys.

PHP Version

This function was first lunched as part of core PHP v 4.3.0.

Example1

Try the following example below. Here "a" => "orange" and "c" => "aple" are present in both arrays, therefore it is not available in the result -

<?php
   $input1 = array( "a"=>"orange", "b"=>"mango", "c"=>"aple");
   $input2 = array( "a"=>"orange", "b"=>"banana", "c"=>"aple");
   print_r(array_diff_assoc($input1, $input2));
?>

Output

When the above code is executed, it will produce the following result -

  Array
(
    [b] => mango
)

Example2

Here, both arrays have different keys and corresponding values for all the pairs, for example "a" => "orange" is not available in the second array, similarly other key value pairs are not present in the second array so they will be available in the result -

<?php
   $input1 = array( "a"=>"orange", "b"=>"mango", "c"=>"banana");
   $input2 = array( "a"=>"banana", "b"=>"apple", "c"=>"orange");
   print_r(array_diff_assoc($input1, $input2));
?>

Output

When the above code is executed, it will produce the following result -

Array
(
    [a] => orange
    [b] => mango
    [c] => banana
)

Example3

This example clarifies that two values from key => value pairs are considered equal only if the (string) $elem1 === (string) $elem2 -

<?php
    $input1 = array(0, 5, 20);
    $input2 = array("00", "05", "20");
    $result = array_diff_assoc($input1, $input2);
    print_r($result);
?>

Output

When the above code is executed, it will produce the following result -

Array
(
    [0] => 0
    [1] => 5
)

READ: PHP array_chunk() Function

Alright guys! This is where we are going to be rounding up for this tutorial post. In our next tutorial, we are going to be discussing about the PHP array_diff_key() Function.

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