Error passing variables using a form php>form>php - php

Question

Please whats wrong with this code?
Im using it to add some data to database but im getting empty $toid and $toname when trying to insert.
This is the form. The variables $toid and $toname are ok here.
//write new message
if (isset($_GET['action']) && $_GET['action'] == compose) {
if (isset($_GET['toid'])) {
$toid = $_GET['toid'];
$tosql = "select * from authors where id =".$toid."";
$toquery = mysql_query($tosql,$connection) or die(mysql_error());
$torow = mysql_fetch_array($toquery);
$toname = $torow['displayname'];
if (isset($_GET['subject'])) { $subject = $_GET['subject']; }
if (isset($_GET['message'])) {
$message = $_GET['message'];
echo "<h3>Replying</h3>
<table>
<tr>
<td colspan='2'>Replying to ".$toname.".</td>
</tr>
<tr>
<td colspan='2'>".$subject."".nl2br($message)."<br />
</td>
</tr>
</table><br />Type your answer:<br /><br />";
} else { echo "New message"; }
echo "<form action=\"mail.php?action=send\" method=post>
<table>
<tr>
<td>To:</td><td><input type=\"text\" name=\"to\" size=\"50\" value=\"".$toname."\"></td>
</tr>
<tr>
<td>Title:</td><td><input type=text name=subject size=50 value=".$subject."></td>
</tr>
<tr>
<td valign=\"top\">Message:</td><td><textarea rows=\"10\" cols=\"70\" name=\"message\"></textarea></td>
</tr>
<tr>
<td align=\"right\" colspan=\"2\"><input id=\"submitstyle\" type=\"submit\" value=\"Enviar Mensagem\"></td>
</tr>
</table>
</form>";
}
}
Here is the code to insert the message to databse, the $toid and $toname are empty here. Its suposed to being retrieved from the form above, right?
//send message
if (isset($_GET['action']) && $_GET['action'] == send) {
if ($subject == "" || $message == "") {
header('Location: mail.php?action=compose&toid='.$toid.'&subject=\''.$subject.'\'&sendpm=false');
exit();
}
$date = DATE(YmdHis);
echo $userid."from<br />to".$toid."<br />toname".$toname;
$sendsql = "INSERT INTO mail (sender, reciever, subject, message, created_at, status, sender_deleted, reciever_deleted)
VALUES (".$userid.", ".$toid.", ".$subject.", ".$message.", ".$date.",unread, 0, 0)";
$sendquery = mysql_query($sendsql,$connection) or die(mysql_error());
echo "<div class=\"alert\" style=\"text-align: center; margin-top: 13px;\"><b>Mensagem particular enviada com sucesso!</b></div>
<br /><table align=\"center\" width=\"75%\" class=\"sortable\">
<tr>
<td colspan='2' style=\"text-align:center;font-weight:normal;\">Mensagem particular enviada para ".$toname.".</td>
</tr>
<tr>
<td colspan='2'>
Title: ".$subject."
Message: ".nl2br($message)."
</td>
</tr>
</table>";
}
Im also getting this sql error You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ' RE: assunto3, 3, 20121017023723,unread, 0, 0)' at line 2 wich i think its because of the empty variables mentioned.

Answer 1

First, you need to pass those variables as hidden form values: http://www.echoecho.com/htmlforms07.htm
Then you need to get the variables from the form via $_POST.
Try $toid = $_POST['toid'] and $toname = $_POST['toname']. But be wary about SQL injection: http://php.net/manual/en/security.database.sql-injection.php
Don't just accept values blindly from $_POST. Be sure to validate and filter them first.
Or if toid/toname aren't changable by the user, why not just requery for them?

Answer 2

You need to escape the INSERT values, and put strings in quotes:
$sendsql = 'INSERT INTO mail (sender, reciever, subject, message, created_at, status, sender_deleted, reciever_deleted)
VALUES ("'.mysql_real_escape_string($userid).'", "'.mysql_real_escape_string($toid).'", "'.mysql_real_escape_string($subject).'", "'.mysql_real_escape_string($message).'", "'.mysql_real_escape_string($date).'","unread", 0, 0)';
Also, be sure you always escape the values that are immediately used in SQL queries from $_GET or $_POST. Otherwise, you are most likely to experience SQL injection

Answer 3

You need to write SQL Statement in php like that:
$tosql = "select * from authors where id ='$toid'";
and
$sendsql = "INSERT INTO mail (sender, reciever, subject, message, created_at, status, sender_deleted, reciever_deleted)
VALUES ('$userid', '$toid', '$subject', '$message', '$date', 'unread', 0, 0)";
i think this will be help you.