Variable not passing on same page using $PHP_SELF

Sulphy

Hi there 😃

I've got a simple HTML page which takes user input and then prints out the input when the submit button is clicked.

the issue i'm faced with is depending where the PHP code is positioned in the HTML i cannot call up the value of a variable:

<?php
echo("Begining " . $a);
?>
<html>

<head>
<title>Test Variables</title>
</head>

<body>
<form>
<form action="<?=$PHP_SELF?>" method="POST">
<input type="TEXT" name="testf" size="10">
<input type="submit" name = "submit" value = "submit"></form><?php
if ("submit" == $submit) {
$a = $testf;
echo( "Bottom " . $a);
}
?>
</body></html>

Any ideas, I need to use session_start function which i understand has to be at the very beggining of an HTML document (correct me if i'm wrong 🙂 ), and the variable i need to use is empty as demonstrated in the above example.

Thanks in advance

Pete 😃

bernouli

there are 2 php codes in your file
each variable can be used inside <?php ?>
it means you cant use your $a in other <?php ?>

Sulphy

Thats what i originally thought but i created another PHP tag under the last tag in the page and it was still able to obtain a value from $a:

<?php
echo("Begining " . $a);
?>
<html>

<head>
<title>Test Variables</title>
</head>

Weedpacket

bernouli is wrong; the problem is probably that $submit and $testf are empty.

You should be referring to them as $POST['submit'] and $POST['testf']

Sulphy

Soz, i'm quite new to PHP, where would you make the amendments to the code, bearing in mind its only the first PHP block that is affected where as the other 2 PHP blocks are fine.

Pete

DigitalExpl0it

<html> 
<head> 
<title>Test Variables</title> 
</head> 
<body>

<?php 
if ($submit == "submit") { 
$a = $testf; 
echo( "Bottom " . $a); 

// Additional tag 
echo("<br>Another tag accesing variable value: " . $a); 
}  else {
?> 

<form> 
<form action="<?=$PHP_SELF?>" method="POST"> 
<input type="TEXT" name="testf" size="10"> 
<input type="submit" name = "submit" value = "submit"></form>

<?PHP 
}
?>
</body></html>

is this what you are trying to do?

looks like the if statement for $submit was in the wrong place.

Sulphy

nope 🙂

the php block at the very beggining isn't passing the value in $a

What should be happening is:

User enters input and clicks 'submit'

The script then reloads the page echoing the new value assigned to $a. Problem being the PHP block at the beggining isn't able to obtain $a value.

DigitalExpl0it

Originally posted by Sulphy
nope 🙂

the php block at the very beggining isn't passing the value in $a

What should be happening is:

User enters input and clicks 'submit'

The script then reloads the page echoing the new value assigned to $a. Problem being the PHP block at the beggining isn't able to obtain $a value.

this should work.. cause if no one ahs clicked submit then it wont goto the $a varible until they click $submit


<html> 
<head> 
<title>Test Variables</title> 
</head> 
<body>

<?php 
if ($submit == "submit") { 
$a = $testf;
echo "Bottom $testf"; 

// Additional tag 
echo "<br>Another tag accesing variable value: $a"; 
}  else {
?> 

<form> 
<form action="<?=$PHP_SELF?>" method="POST"> 
<input type="TEXT" name="testf" size="10"> 
<input type="submit" name = "submit" value = "submit"></form>

<?PHP 
}
?>
</body></html>

try this, it worked for me

DigitalExpl0it

here test it out...using the same code

http://rbcode.com/go.php

Sulphy

it works fine 🙂 but it lacked the first PHP block:

<?php
echo("Begining " . $a);
?>
<html>

<head>
<title>Test Variables</title>
</head>

Cause i'm thinking, once 'submit' is clicked '$a' is assigned a value, therefore when the page is reloaded using $PHP_SELF the first call to $a should work, but it doesn't.

This example serves a higher purpose, because i'm trying to use session_start and session_register, which i understand have to be at the 'very' beggining of a HTML page, but variables i defined later in the script arn't accessible.

Weedpacket

But that's because in the script you give, $a isn't given any value until half way through - long after its value was supposed to be echoed.

If you're experimenting with handling sessions, perhaps a more complete description of the problem (with code) might prevent further confusion on our part.

Cause i'm thinking, once 'submit' is clicked '$a' is assigned a value, therefore when the page is reloaded using $PHP_SELF the first call to $a should work, but it doesn't.

No, because when you click 'submit', the only variables that will be set on the form action script ($PHP_SELF), will be $testf and $submit (actualyl, $POST['testf'] and $POST['submit'] if you have register_globals turned off, which is a good idea); those being the fields in the form.

Sulphy

Hi, soz about not getting back to you sooner, just wanted to say thank you for your help, its sorted out quite a few things 😃

Pete