Forum Topics

[MemphiS]

I have the PHPMYADMIN column set to TEXT.

 

My question is:  DO i need to check the contents for possible sql injections if im inserting the data in a TEXT column.

 

Currenlty this is my code below i use to check new topics.

 

Have you got a better way of doing this?

 

<?php
if (isset($_POST['subnewtop'])){
$topic  = strip_tags(addslashes($_POST['topcontent']));
$toaddtitle = ucfirst(strip_tags(addslashes($_POST['subject'])));
$mytopictot = mysql_num_rows(mysql_query("SELECT `id` FROM `forum_topic` WHERE `username` = '$username' AND `forum` = 'help'"));

// Validate submited data //
if (empty($topic) || empty($toaddtitle)){
print("Missing contents or subject.");
}elseif (!empty($topic) && !empty($toaddtitle)){
   
if(!ctype_alnum(str_replace(array("[", "/", "]", " ", ".", ":", ")", ",", "!", "#", "$", "%", "^", "(", "_", "-", "+", "=", "?", ";","\r\n"), '', $topic))) {
    print("Invalid contents. BBcodes and spaces are allowed.");
}elseif(ctype_alnum(str_replace(array("[", "/", "]", " ", ".", ":", ")", ",", "!", "#", "$", "%", "^", "(", "_", "-", "+", "=", "?", ";","\r\n"), '', $topic))) {

$topic = str_replace("\r\n","<br />",$topic);

if(!ctype_alnum(str_replace(array(" "), '', $toaddtitle))){
    print("Illegal characters in title.");
    }elseif(ctype_alnum(str_replace(array(" "), '', $toaddtitle))){


if ($mytopictot > 9){
print("You have 10 topics open already. Please await forum clearing before you open any new topics.");
}elseif ($mytopictot < 10){

// Then insert data
}}}}
}
?>
<table border='1' cellpadding='2' cellspacing='0' bordercolor='#000000'>
<tr><td class='header' align='center' colspan="2">New Topic</td></tr>
<tr><td>Subject</td><td><input type="text" name="subject" maxlength="30" class="input" /></td></tr>
<tr><td colspan="2"><textarea name="topcontent" rows="10" cols="40" class="input"></textarea></td></tr>
<tr><td align="right" colspan="2"><input type="submit" name="subnewtop" value="Submit" class="input" /></td></tr>
</table>

[trq]

DO i need to check the contents for possible sql injections if im inserting the data in a TEXT column

 

Yes, you need to validate/clean user input anytime you use it in any query, even SELECT statements, no matter what the field type is.