String Replacement

**Titan85** · 04-13-2007, 07:09 PM

Ok, I am trying to make a string replacer to do what forums do with replacing BBC code and smilies. Here is what I have:

PHP Code:


<?php require('config.php'); ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Posts</title>
</head>

<body>
<?php
    $get = mysql_query("SELECT * FROM `messages` ORDER BY id DESC") or die (mysql_error());
    while ($p = mysql_fetch_array($get)) {
    
        $get_replace = mysql_query("SELECT * FROM `replacements`") or die ('Error getting replacements! <br />' .mysql_error());
        while ($r = mysql_fetch_array($get_replace)) {
            extract($r);
            $post = str_replace($tbefore, $tafter, $p['message']);
        }
        
        echo '
        <b>'.$p['title'].'</b>
            <br />
        '.$post.'';
    }
    
?>
</body>
</html>

I have 3 things to replace in the database, but it only replaces one of them. I thought that this would be fixed with the while statement, but still nothing. Any ideas? thanks

**Twey** · 04-13-2007, 08:23 PM

That's the wrong MIME type for XHTML.

Your problem is here:

Code:

            $post = str_replace($tbefore, $tafter, $p['message']);

Say you have replacements:

Code:

+---------+--------+
| tbefore | tafter |
+---------+--------+
| :)      | smile  |
| :(      | frown  |
+---------+--------+

and a post (stored in $p['message']):

Code:

Lorem :) ipsum dolor :( sit amet...

That line will be executed once for each replacement. So, first of all, it takes $p['message'], replaces each :) with smile:

Code:

Lorem smile ipsum dolor :( sit amet...

... and stores the result in $post. Then, it takes $p['message'] again (which is unmodified: remember, the result of the last loop was stored in $post), and applies the next replacement:

Code:

Lorem :) ipsum dolor frown sit amet...

You want to store the results back into $p['message']:

Code:

            $p['message'] = str_replace($tbefore, $tafter, $p['message']);

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