Get Users Comment From Mysql using Php
<?php
// Insert Comments into Database that user provides
$comm = mysql_real_escape_string($_POST['addComment']);
$pID4 = filter_input(INPUT_GET, 'pID', FILTER_SANITIZE_NUMBER_INT);
$cID = mysql_real_escape_string($_POST['courseInfoDD']);
        $username = "###";
        $password = "####";
        $pdo4 = new PDO('mysql:host=localhost;dbname=###', $username, $password);
        $pdo4->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );
$sth3 = $pdo3->prepare('
        INSERT INTO Comment (info, pID, cID)
        VALUES(:info, :pID, :cID)
             ');
$sth3->execute(array(
            ':info' => $comm, ':pID' => $pID3, ':cID' => $cID
        ));
?>

<input type='text' id='addComment' name='addComment' tabindex='3' value='Enter comment' />

$sth3 = $pdo3->prepare('
    INSERT INTO Comment (info, pID, cID)
    VALUES($comm, $pID3, $cID)
');

$sth3 = $pdo3->prepare('
    INSERT INTO Comment (info, pID, cID)
    VALUES(:comm, :pID3, :cID)
');

$sth3 = $pdo3->prepare('
        INSERT INTO Comment (info, pID, cID)
        VALUES(:info, :pID, :cID)
             ');
$sth3->execute(array(
            ':info' => $comm, ':pID' => $pID3, ':cID' => $cID
        ));

$sth3 = $pdo3->prepare("
        INSERT INTO Comment (info, pID, cID)
        VALUES('$comm', '$pID3', '$cID')
             ");