PHP if-statement using $_POST variable doesn't seem to work. Why?

Question

On one PHP server I have two files. One file (the name is "first.php") contains this code:

<html>
<head>
<title>First Page</title>
</head>
<body>
Please enter your password and age:
<form action="pass.php" method="post">
Name: <input type="text" name="fname" />
Age: <input type="text" name="age" />
<input type="submit" />
</form>
</body>
</html>

The other file ("pass.php") contains this code:

<html>
<head>
<title>Secon Page</title>
</head>
<body>
<?php
if ($fname=="Jack")
  echo "You are Jack!";
else
  echo "You are not Jack!";
?>
</body>
</html>

As far as I understand, if a user enters "Jack" in the first page, than the second page should be displayed with "You are Jack!" line, but it doesn't happen. Why is it so?

darthnosaj · Accepted Answer · 2009-11-22 02:59:40Z

5

On your second page, instead of checking for $fname, check for $_POST['fname'] instead. I think that is all you are missing.

answered Nov 22, 2009 at 2:59

darthnosaj

2614 silver badges12 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

darthnosaj Over a year ago

You're very welcome. I hope your future php endeavors go well!

Pete · Accepted Answer · 2009-11-22 03:34:47Z

3

You probably don't have register_globals set. This is depreciated and will be removed in 6.x. So for good programming you should instead of $fname try $_POST['fname'] on your second page.

edited Nov 22, 2009 at 3:34

answered Nov 22, 2009 at 2:59

Pete

414 bronze badges

Comments

Ben Shelock · Accepted Answer · 2009-11-22 03:41:27Z

1

pass.php needs to look like this

<html>
<head>
<title>Secon Page</title>
</head>
<body>
<?php
if ($_POST['fname'] =="Jack")
  echo "You are Jack!";
else
  echo "You are not Jack!";
?>
</body>
</html>

answered Nov 22, 2009 at 3:41

Ben Shelock

21.1k26 gold badges98 silver badges127 bronze badges

Comments

Jason Plank · Accepted Answer · 2011-11-29 16:34:48Z

1

It might help to set the post values as variables and work with that. Something like this:

foreach($_POST as $key => $value)
{
  $$key = $value;
}

Then whatever is posted will be available rather than using $_POST['xxxxx'] in your logic.

edited Nov 29, 2011 at 16:34

Jason Plank

2,3325 gold badges32 silver badges40 bronze badges

answered Nov 22, 2009 at 3:36

chris

111 bronze badge

2 Comments

bobince Over a year ago

This is an even worse idea than register_globals, as it can overwrite any variables you have used in your script previously. And you'll still get loads of warnings for variables that aren't passed in.

chris Over a year ago

Yes, it can overwrite variables previously set, but you can do that anywhere. Naming is one of the most difficult aspects of programming! However, I would rather not be repeating myself with $_POST['key'] throughout my logic.

Collectives™ on Stack Overflow

PHP if-statement using $_POST variable doesn't seem to work. Why?

4 Answers 4

1 Comment

Comments

Comments

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

4 Answers 4

1 Comment

Comments

Comments

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related