[web] PHP HELP
Author
I can't seem to figure out why these functions don't work like they should work. Can someone help me?
<html>
<?php
echo $mark;
session_start();
if ($_POST["action"] == "Previous 20")
{
$mark = $mark - 20;
}
if ($_POST["action"] == "Next 20")
{
$mark = $mark + 20;
}
if ($_POST["action"])
{
?>
<script>window.location="<?php echo $PHP_SELF?>?mark=<?php echo $mark?>"</script>
<?
}
?>
<body>
<form method="post" action="<?php echo $PHP_SELF?>">
<input type=submit name="action" value="Next 20">
<input type=submit name="action" value="Previous 20">
</form></body></html>
You must use session_start() before you send anything to the browser, like your opening html tag.
Quote:Original post by Invader XTo add to this: anything includes whitespace, which can catch you out. I also reckon <?php echo $PHP_SELF?> should be <?php echo $_SERVER['PHP_SELF']; ?> (I don't know if that would break, though). Forms will sumbit to the page they are on if you don't specify an action parameter, too.
You must use session_start() before you send anything to the browser, like your opening html tag.
You can't just use $mark and imagine that it will somehow magically be preserved between pages.
Use $mark = $_REQUEST['mark'] or something similar. Add "mark" as a hidden field to the form.
Ensure that register_globals is off - it's a misfeature and will confuse you and break your apps in subtle and dangerous ways.
Mark
Use $mark = $_REQUEST['mark'] or something similar. Add "mark" as a hidden field to the form.
Ensure that register_globals is off - it's a misfeature and will confuse you and break your apps in subtle and dangerous ways.
Mark
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