PHP Array Exercises : Returns values of the first array that are not in the second array

PHP Array: Exercise-45 with Solution

Write a PHP script to do a multi-dimensional difference, i.e. returns values of the first array that are not in the second array.

Sample Solution:

PHP Code:

$color1 = array( array('Red', 80), array('Green', 70), array('white', 60) ); 
$color2 = array( array('Green', 70), array('Black', 95) ); 
$color = array_udiff($color1, $color2, create_function( 
    '$a,$b', 'return strcmp( implode("", $a), implode("", $b) ); ') 

Sample Output:

    [0] => Array                                            
            [0] => Red                                      
            [1] => 80                                       
    [2] => Array                                            
            [0] => white                                    
            [1] => 60                                       


Flowchart: PHP - Returns values of the first array that are not in second array

PHP Code Editor:

Contribute your code and comments through Disqus.

Previous: Write a PHP a function to remove a specified duplicate entry from an array.
Next: Write a PHP function to check whether all array values are strings or not.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.

Follow us on Facebook and Twitter for latest update.

PHP: Tips of the Day

PHP: Where does PHP store the error log? (php5, apache, fastcgi, cpanel)

PHP stores error logs in /var/log/apache2 if PHP is an apache2 module. Shared hosts are often storing log files in your root directory /log subfolder. But...if you have access to a php.ini file you can do this:

error_log = /var/log/php-scripts.log

According to rinogo's comment: If you're using cPanel, the master log file you're probably looking for is stored (by default) at


If all else fails you can check the location of the log file using

<?php phpinfo(); ?>

Ref : https://bit.ly/2EffgH5


We are closing our Disqus commenting system for some maintenanace issues. You may write to us at reach[at]yahoo[dot]com or visit us at Facebook