Replacing the first and last letter in a word

Question

I tried to make the first letter replace with the last letter in a word. Here is my code for now. There is a text-area where you can't put text in and the words will be seen under each other. But I could not find a way to make a letter-change QQ

$array = explode(" ", $_POST["text"]);
if ($_POST["submit"])
{

    echo "<pre>";
    foreach ($array as $lijst)
    {
        if (strlen($lijst)>4)
        {
            
            $lijst1= substr_replace($lijst, $lijst[0],-1);
            echo $lijst1;
            echo "<br/>";
        }else{
            echo $lijst;
            echo "<br/>";
        }
    }
    echo "</pre>";
}

Answer 1

Try this.

        foreach ($array as $lijst)
        {
            if (strlen($lijst)>4)
            {
                $first = $lijst[0];
                $last = $lijst[strlen($lijst)-1];

                $lijst[0] = $last;
                $lijst[strlen($lijst)-1] = $first;

                echo $lijst;
                echo "<br/>";
            }else{
                echo $lijst;
                echo "<br/>";
            }
        }

It will change the first and last in a word that has a string length larger then 4