Get the value from previous page php, sql - php

Question

I can't get the value of id from update.php and give to it another page which is update2.php
Here is the code of my update.php
<form method = "post" action = "update2.php ?id=".$row['0'].">
<p class = "head">Update Account Basic Info</p>
<p class = "form">
<input type = "text" class = "name" name = "f_name" placeholder = "First Name">
<input type = "text" class = "name" name = "l_name" placeholder = "Last Name">
<br>
<input type = "text" class = "other" name = "email" placeholder = "Email Address">
<br>
<input type = "numeric" class = "other" name = "mob_no" placeholder = "Mobile Number">
<br></br>
<input type = "submit" name = "save" value = "Update Account">
</p>
</form>
<?php
$con = mysql_connect("localhost","root","");
mysql_select_db("dbfacebook", $con);
$query = "SELECT id_no, f_name, l_name, email, mob_no FROM tblaccount WHERE id_no = '$_GET[id]'";
$result = mysql_query($query);
while($row = mysql_fetch_array($result)){
echo "<p class = 'sub'>Current Account Basic Info</p>";
echo "<p class = 'form'>ID Number: ".$row['0']."<br>";
echo "First Name: ".$row['1']."<br>";
echo "Last Name: ".$row['2']."<br>";
echo "Email: ".$row['3']."<br>";
echo "Mobile Number: ".$row['4']."</p>";
}
mysql_close();
?>
Here is my code of update2.php
<?php
$con = mysql_connect("localhost","root","");
mysql_select_db("dbfacebook", $con);
echo $_GET['id'];
mysql_query("UPDATE tblaccount SET f_name = '$_POST[f_name]', l_name = '$_POST[l_name]', email = '$_POST[email]', mob_no = '$_POST[mob_no]' WHERE id_no = '$_GET[id]'");
echo "<h1>Account Updated</h1>";
mysql_close($con);
?>
My problem is my $_GET[id] function in update2.php can't get the value of id_no in update.php

Answer 1

You wont get the right result when you use
action = "update2.php ?id=".$row['0']."
because, .$row['0']. is not php.. It is just HTML..
Instead, you will have to use
action = "update2.php?id=<?php echo $row['0']; ?>"
UPDATE
Since you are getting Undefined variable: row error, it means that $row is null.
Thus, Move
$con = mysql_connect("localhost","root","");
mysql_select_db("dbfacebook", $con);
$query = "SELECT id_no, f_name, l_name, email, mob_no FROM tblaccount WHERE id_no = '$_GET[id]'";
$result = mysql_query($query);
to the line before opening the <form>.
ie, Now, the code should be like
<?php
$con = mysql_connect("localhost","root","");
mysql_select_db("dbfacebook", $con);
$query = "SELECT id_no, f_name, l_name, email, mob_no FROM tblaccount WHERE id_no = '$_GET[id]'";
$result = mysql_query($query);
while($row = mysql_fetch_array($result)){
<form method = "post" action = "update2.php?id=<?php echo $row['0']; ?>">
}
?>