GPIO.php

<?php
	class GPIO {



		/* PRIVATE vars */
		var $_gpio_pin = "null";
		var $_gpio_direction = "null";
    var $_pwm_number = "null";



		/* CONTRUCTOR */
		public function __construct($_gpio_pin, $_gpio_direction, $_pwm_number) {
			$this->_set_gpio_pin($_gpio_pin);
			$this->_set_gpio_direction($_gpio_direction);	
      $this->_pwm_number = $_pwm_number;
		}



		/* PRIVATE METHODS */

		private function _set_gpio_pin($_gpio_pin) {
			$this->_gpio_pin = $_gpio_pin;
		}

		private function _set_gpio_direction($_gpio_direction) {
			if (strtolower($_gpio_direction) == "in" || strtolower($_gpio_direction) == "input")
				$_gpio_direction = "in";
			else if (strtolower($_gpio_direction) == "out" || strtolower($_gpio_direction) == "output")
				$_gpio_direction = "out";

			$this->_gpio_direction = $_gpio_direction;

			exec("gpio export ". $this->get_gpio_pin() ." ". $this->get_gpio_direction());			
		}
		


		/* PUBLIC METHODS */

		public function get_gpio_pin() {
			return $this->_gpio_pin;
		}

		public function get_gpio_direction() {
			return $this->_gpio_direction;
		}

		public function write($_state) {
			if (strtolower($_state) == 1 || strtolower($_state) == "1" || strtolower($_state) == "high" || strtolower($_state) == "hi" || strtolower($_state) == "on" )
				$_state = 1;
			else if (strtolower($_state) == 0 || strtolower($_state) == "0" || strtolower($_state) == "low" || strtolower($_state) == "lo" || strtolower($_state) == "off" )
				$_state = 0;

			exec( "gpio -g write ". $this->get_gpio_pin() ." ". $_state );
		}

		public function read() {
			
			return exec( "gpio -g read ". $this->get_gpio_pin(), $status);
			// return $status;
		}

    public function pwm_write($_value) {
      if ($_value > -1 && $_value < 256) {
        return exec( "echo " . $this->_pwm_number . "=" . $_value . " > /dev/servoblaster");
      }
    }
	}
?>