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:

PHP Code Editor:
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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.
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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
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