Question

HTML

<form method="post">
    <input type="text" name="values" value="1,2,1,3,4,2,2,5" />
    <button type="submit">Submit</button>
</form>

PHP

if(isset($_POST['values']))
{
    $values = $_POST['values']); //remove duplicate numbers

    echo $values;
}

Output

1,2,3,4,5

How would that work? First sort the numbers? And then run them through a loop?

Answer 1

Your intution is correct: You’d sort and then loop.

But PHP already has built-ins that do all the work for you. Like this:

array_unique(explode(',', $_POST['values']));

and if you need a string again, use implode:

implode(',', array_unique(explode(',', $_POST['values'])));

• http://www.php.net/array_unique
• http://www.php.net/explode
• http://www.php.net/implode