Write text from a form into a text file

The script is not having the desired effect. The message entered is not being written into the text file. If I replace line: fwrite($file, $message); with fwrite($file, "Hellow World"); It works, suggesting that variable $message is not storing any data. Any help would be most appreciated The HTML Script:

<body>
<form method="post" action="">
<textarea name="WMessage" rows ="5" cols="40"></textarea> Enter your message!<br />
<input type="submit" name="submit" value="Save Message">
</form>

The PHP Script:

<?PHP
    if($_POST['submit'] == "Save Message") {
        $message = $_Post["WMessage"];
        $file = fopen("test.txt", "w") or die("can't open file");
        fwrite($file, $message);
        fclose($file);
    }
    echo $message;
?>

Solution

This $_Post in $_Post["WMessage"]; must be in uppercase, it's a superglobal.

http://php.net/manual/en/language.variables.superglobals.php

$_POST["WMessage"];