Passing HTML hidden variable through a PHP script

Question

I have an HTML form that is echoed from my php script. When I try to pass a hidden variable through the script, the code does not work as intended.

$threadNumber=$row["Tid"];
echo "<center><b>Message# ", $messageNumber , ": </b><br>";
echo $row["Mtitle"] , " in Thread# " , $row["Tid"] , "<br>";
echo "The Message was Written on " , $row["Mdate"] , '<br>';
echo $row["Mbody"];
echo "<br><br>";
echo '<form action="messageReply.php" method="post">';
echo '<textarea name="reply" rows=5 cols=30 placeholder="Reply to the Message?"></textarea>';
echo '<input type="hidden" name="Mtitle" value="<?php echo $row["Mtitle"] ?>">';
echo '<input type="submit" value="Send Message">';
echo '</form>';

The result looks like this:

and when I try to read $_POST["Mtitle"] in the messageReply.php script, I get an error saying such an index does not exist.

You cant use PHP in php.. echo '<input type="hidden" name="Mtitle" value="' . echo $row["Mtitle"] . '">'; - you did it correct in previous code, why suddenly the change of heart? — Naruto
– Naruto, Commented Dec 23, 2015 at 10:51
@Crt: chose the best answer and mark as accepted if you feel your issue has been resolved because it will be help full for others who are facing same issue. — devpro
– devpro, Commented Dec 23, 2015 at 12:17

devpro · Accepted Answer · 2015-12-23 10:57:39Z

1

Try this:

echo '<input type="hidden" name="Mtitle" value='.$row['Mtitle'].'>';

Your Complete Code (Modified):

$threadNumber=$row["Tid"];
echo "<center><b>Message# ", $messageNumber , ": </b><br>";
echo $row["Mtitle"] , " in Thread# " , $row["Tid"] , "<br>";
echo "The Message was Written on " , $row["Mdate"] , '<br>';
echo $row["Mbody"];
echo "<br><br>";
echo '<form action="messageReply.php" method="post">';
echo '<textarea name="reply" rows=5 cols=30 placeholder="Reply to the Message?"></textarea>';
echo '<input type="hidden" name="Mtitle" value='.$row['Mtitle'].'>';
echo '<input type="submit" value="Send Message">';
echo '</form>';

answered Dec 23, 2015 at 10:57

devpro

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3 Comments

devpro Over a year ago

this is good, if you are new on SO, accept the best answer, this will help for other who face this issue. @Crt

kgui Over a year ago

sure, no problem. Sorry, was busy. Can you, or anyone else explain, why this worked.

devpro Over a year ago

@crt: for this I suggest to read single quote and double quote how it works... u will get basic idea brother

rahul sharma · Accepted Answer · 2015-12-23 11:01:09Z

1

Note: You are using php in php. Please change it below code:

<?php
echo '<input type="hidden" name="Mtitle" value="'.$row["Mtitle"].'">';
?>

answered Dec 23, 2015 at 11:01

rahul sharma

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