w3resource

PHP Array Exercises : Identify the email addresses which are not unique

PHP Array: Exercise-41 with Solution

Write a PHP program to identify the email addresses which are not unique.

Sample Solution:

PHP Code:

<?php
function array_not_unique($my_array) {
    $same = array();
    natcasesort($my_array);
    reset ($my_array);

    $old_key    = NULL;
    $old_value    = NULL;
    foreach ($my_array as $key => $value) {
        if ($value === NULL) { continue; }
        if ($old_value == $value) {
            $same[$old_key]    = $old_value;
            $same[$key]        = $value;
        }
        $old_value    = $value;
        $old_key    = $key;
    }
return $same;
}

$test_array = array();
$test_array[1]    = '[email protected]';
$test_array[2]    = '[email protected]';
$test_array[3]    = '[email protected]';
$test_array[4]    = '[email protected]';

print_r(array_not_unique($test_array));
?>

Sample Output:

Array                                                               
(                                                                   
    [1] => [email protected]                                          
    [3] => [email protected]                                          
)

Flowchart:

Flowchart: PHP - Identify the email addresses which are not unique

PHP Code Editor:

Contribute your code and comments through Disqus.

Previous: Write a PHP program to get a sorted array without preserving the keys.
Next: Write a PHP function to find unique values from multidimensional arrays and flatten them in 0 depth.

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

/usr/local/apache/logs/error_log

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