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<html> <head> <title>GPIO Test Page</title> </head> <p>GPIO Test Page</p> <form action="gpio.php" method="get"> <input type="submit" value="Turn On"> <input type="hidden" name="action" value="on"> </form> <form action="gpio.php" method="get"> <input type="submit" value="Turn Off"> <input type="hidden" name="action" value="off"> </form> </html> <?php $filename = "gpio.txt"; If (isset($_GET['action'])){ If ($_GET['action'] == "on"){ $fileHandle = fopen($filename, 'w') or die ("can't open file"); fclose($fileHandle); } else If ($_GET['action'] == "off"){ unlink($filename); } } ?>