<?php
if(isset($_POST['data'])) {
echo "<PRE>";
print_r($_POST['data']);
echo "</PRE>";
    $ret = file_put_contents('testfile.txt', $_POST['data'], LOCK_EX);
    if($ret === false) {
        die('There was an error writing this file');
    }
    else {
        echo "$ret bytes written to file";
    }
}
?>
<form action="" method="POST">
<textarea id="data" name="data" rows="4" cols="50">
</textarea>
    <input type="submit" name="submit" value="Save Data">
</form>