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    <p>The problem you had is that you've got your regular expression check within the <code>get_magic_quotes_gpc()</code> call, Joel's code also has <code>reg_replace</code> as a typo, otherwise that would have worked (if you'd have put it outside of the magic quotes check.</p> <p>Here's a fully updated script for you to try.</p> <pre><code>&lt;?php ob_start(); // check if the review form has been sent if(isset($_POST['review_content'])) { if(isset($_POST['review_recipient'])) { $content = $_POST['review_content']; $review_recipient = $_POST['review_recipient']; //We remove slashes depending on the configuration if(get_magic_quotes_gpc()) { $content = stripslashes($content); $review_recipient = stripslashes($review_recipient); } $regex = "/(https?:\/\/)?([\da-z\.-]+)\.([a-z\.]{2,6})([\/\w\.-]*)*\/?/"; $replacement = "[blocked url]"; $review_recipient = preg_replace($regex,$replacement,$_POST['review_recipient']); //$profile_id = intval($_POST['profile_id']); //dont know how you get this $content = preg_replace($regex,$replacement,$_POST['review_content']); //We check if all the fields are filled if($_POST['review_content']!='') { if($_POST['review_recipient']!='') { $sql = "INSERT INTO ptb_reviews (id, from_user_id, from_guest, to_user_id, content) VALUES (NULL, '-1', '".$review_recipient."', '".$profile_id."', '".$content."');"; mysql_query($sql, $connection); $_SESSION['message']="&lt;div class=\"infobox-wallpost\"&gt;&lt;strong&gt;Thank You&lt;/strong&gt; - Your review has been sent and is awaiting approval.&lt;/div&gt;&lt;div class=\"infobox-close4\"&gt;&lt;/div&gt;"; header("Location: {$_SERVER['HTTP_REFERER']}"); } } } } ?&gt; </code></pre> <p>If you want to block specific words you can also add something like this:</p> <pre><code>$regex2 = "/(.*)\b(word1|word2|word3)\b(.*)/"; $replacement2 = "[blocked word]"; </code></pre> <p>Then change your <code>preg_replace</code> to something like this:</p> <pre><code>$content = preg_replace(Array($regex, $regex2),Array($replacement, $replacement2),$_POST['review_content']); </code></pre>
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