Thank you for this bug report. To properly diagnose the problem, we
need a short but complete example script to be able to reproduce
this bug ourselves. 

A proper reproducing script starts with <?php and ends with ?>,
is max. 10-20 lines long and does not require any external 
resources such as databases, etc.

If possible, make the script source available online and provide
an URL to it here. Try to avoid embedding huge scripts into the report.

Please check that you don't have any of zend_extension's loaded.

You want me to give you guys the function so you could try it out yourselves?

How can we test if we don't know what to test?
Create the shortest possible test script you can
and add it here.

<?php

function sys_msg($error,$exit) {

if($exit==0)
{
echo ''.$error.'';
} elseif($exit==1) {
echo ''.$error.'';

exit;
} elseif(!strlen($exit)) {
echo ''.$error.'';
}
}

if(isset($_POST['submit']))
{
sys_msg('You clicked the button!','0');
} else {
echo '';
}

?>
<form action="<?=$_SERVER['PHP_SELF']?>" method="POST">
<input type="submit" name="submit" value="Click Me" />
</form>



That's the shortest script I could make..

Again, please check that you don't have any of zend_extensions like MMCache, ionCube, Zend Optimizer etc.

And your code works fine with all the latest 5.1, 5.0.x & 4.3.x versions .

Here is the complete config file:  http://subzer0.net/reloaded/cfg.inc.phps

I don't think I have any extensions, as I have never experienced this problem before.

Sorry, but your problem does not imply a bug in PHP itself.  For a
list of more appropriate places to ask for help using PHP, please
visit http://www.php.net/support.php as this bug system is not the
appropriate forum for asking support questions.  Due to the volume
of reports we can not explain in detail here why your report is not
a bug.  The support channels will be able to provide an explanation
for you.

Thank you for your interest in PHP.