├── GPIO.php
├── README.mdown
└── testGPIO.php


/GPIO.php:
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 1 | <?php 
 2 | 	class GPIO {
 3 | 
 4 | 		// Using BCM pin numbers.
 5 | 		private $pins = ['0', '1', '4', '7', '8', '9', '10', '11', '14', '15', '17', '18', '21', '22', '23', '24', '25'];
 6 | 
 7 | 		// exported pins for when we unexport all
 8 | 		private $exportedPins = array();
 9 | 
10 | 		// Setup pin, takes pin number and direction (in or out)
11 | 		public function setup($pinNo, $direction) {
12 | 			// Check if valid BCM number
13 | 			if($this->isValidPin($pinNo)) {
14 | 				// if exported, unexport it first
15 | 				if($this->isExported($pinNo)) {
16 | 					$this->unexport($pinNo);
17 | 				}
18 | 
19 | 				// Export pin
20 | 				file_put_contents('/sys/class/gpio/export', $pinNo);
21 | 
22 | 				// if valid direction then set direction
23 | 				if($this->isValidDirection($direction)) {
24 | 					file_put_contents('/sys/class/gpio/gpio'.$pinNo.'/direction', $direction);
25 | 				}
26 | 
27 | 				// Add to exported pins array
28 | 				$exportedPins[] = $pinNo;
29 | 			} else {
30 | 				echo 'Error! Not a valid pin!';
31 | 			}
32 | 		}
33 | 
34 | 		public function input($pinNo) {
35 | 			if($this->isExported($pinNo)) {
36 | 				if($this->currentDirection($pinNo) != "out") {
37 | 					return file_get_contents('/sys/class/gpio/gpio'.$pinNo.'/value');
38 | 				} else {
39 | 					echo 'Error! Wrong Direction for this pin!';
40 | 				}
41 | 			}
42 | 		}
43 | 
44 | 		// Value == 1 or 0, where 1 = on, 0 = off
45 | 		public function output($pinNo, $value) {
46 | 			if($this->isExported($pinNo)) {
47 | 				if($this->currentDirection($pinNo) != "in") {
48 | 					file_put_contents('/sys/class/gpio/gpio'.$pinNo.'/value', $value);
49 | 				} else {
50 | 					echo 'Error! Wrong Direction for this pin! Meant to be out while it is ' . $this->currentDirection($pinNo);
51 | 				}
52 | 			}
53 | 		}
54 | 
55 | 		public function unexport($pinNo) {
56 | 			if($this->isExported($pinNo)) {
57 | 				file_put_contents('/sys/class/gpio/unexport', $pinNo);
58 | 				foreach ($this->exportedPins as $key => $value) {
59 | 					if($value == $pinNo) unset($key);
60 | 				}
61 | 			}
62 | 		}
63 | 
64 | 		public function unexportAll() {
65 | 			foreach ($this->exportedPins as $key => $pinNo) file_put_contents('/sys/class/gpio/unexport', $pinNo);
66 | 			$this->exportedPins = array();
67 | 		}
68 | 
69 | 		// Check if exported
70 | 		public function isExported($pinNo) {
71 | 			return file_exists('/sys/class/gpio/gpio'.$pinNo);
72 | 		}
73 | 
74 | 		public function currentDirection($pinNo) {
75 | 			return file_get_contents('/sys/class/gpio/gpio'.$pinNo.'/direction');
76 | 		}
77 | 
78 | 		// Check for valid direction, in or out
79 | 		public function isValidDirection($direction) {
80 | 			return (($direction == "in") || ($direction == "out"));
81 | 		}
82 | 
83 | 		// Check for valid pin
84 | 		public function isValidPin($pinNo) {
85 | 			return in_array($pinNo, $this->pins);
86 | 		}
87 | 	}
88 | ?>


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/README.mdown:
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 1 | This is version 1.0 of the PHP-GPIO.
 2 | 
 3 | It is a simple PHP library to alloww access to the GPIO on the Raspberry Pi.
 4 | 
 5 | The code should be readable enough to not need a guide, check the testGPIO.php file for an example of basic use.
 6 | 
 7 | ---
 8 | 
 9 | ##Licensing
10 | 
11 | Copyright (C) 2012 Aaron Pearce
12 | 
13 | Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
14 | 
15 | The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
16 | 
17 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.


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/testGPIO.php:
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 1 | <?php
 2 |         require_once('GPIO.php');
 3 | 
 4 |         echo "Setting up Pins 17 and 22\n";
 5 |         $gpio = new GPIO();
 6 |         $gpio->setup(17, "out");
 7 |         $gpio->setup(22, "out");
 8 | 
 9 |         echo "Turning on Pins 17 and 22\n";
10 |         $gpio->output(17, 1);
11 |         $gpio->output(22, 1);
12 | 
13 |         echo "Sleeping!\n";
14 |         sleep(3);
15 | 
16 |         echo "Turning off Pins 17 and 22\n";
17 |         $gpio->output(17, 0);
18 |         $gpio->output(22, 0);
19 | 
20 |         echo "Unexporting all pins\n";
21 |         $gpio->unexportAll();
22 | 
23 | ?>


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