Please have a look to the following code:
<?php
$nomeDominio='';
if (isset($_GET['infoDominio']))
{
$nomeDominio = $_GET['nomeDominio'];
echo "I'm getting ".$nomeDominio;
}
if (isset($_POST['atualizarDominio']))
{
echo "I'm posting ".$nomeDominio;
}
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Test Case 99</title>
</head>
<body>
<form name="infoDominio" action="<?php echo htmlentities($_SERVER['PHP_SELF']);?>" method="get">
<input id="nome_dominio" type="text" name="nomeDominio" value="<?php echo $nomeDominio; ?>"/>
<br />
<button name="infoDominio" type="submit">Obtem informacao</button>
</form>
<form action="<?php echo htmlentities($_SERVER['PHP_SELF']);?>" name="atualizarDominio" method="post">
<input type="hidden" value="<?php echo $nomeDominio ?>" name="nome-dominio"/>
<br />
<button type="submit" name="atualizarDominio">atualizar domínio</button>
</form>
</body>
</html>
You can copy/paste - it will serve as test case.
Like this, IF we get and then we post: The value from GET WILL NOT pass into POST.
The thing is: If we just change the action= property of the second form element to, instead of having the $_SERVER['PHP_SELF'], to have just action=""; you will notice that the value WILL pass.
My question is: Why?
ADDITIONAL NOTE: This is not something to solve. Instead, this is something to understand why is it happening this way. Why, if we change the action on the second form to action="", the value stored in $nomeDominio pass from one conditional into another? The code sample can be used by itself, so you can perfectly test this very easily and see what I'm talking about.
