lightcontrol.php

<?php
// Author: Andrew Afonso
// Description: A simple controller that sets the colors on a GPIO controlled LED strip on a RasPi
// https://github.com/andrewbluepiano/SignPi/

// Remove the pound from the hexidecimal value passed in
$colorHex = str_replace('#', '', $_POST['lightcolor']);
$brightness = intval($_POST['brightness']);

// If a full hexidecimal value
if(strlen($colorHex) == 6){
	// Split the values into their sub RGB values
	$rgb_array = str_split($colorHex, 2);
	
	// Convert from hesidecimal values to RGB values, but also invert the values because... pigpio
	$red = 255 - hexdec($rgb_array[0]);
	$green = 255 - hexdec($rgb_array[1]);
	$blue = 255 - hexdec($rgb_array[2]);
	
	shell_exec("pigs p 14 " . $red);
	shell_exec("pigs p 4 " . $blue);
	shell_exec("pigs p 24 " . $green);
}

if($brightness < 226){
	shell_exec("pigs p 7 " . $brightness);
}

header('Location: ../');
?>