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lbadger/PHP GPIO Lib for Raspberry Pi

Forked from aaronpearce/PHP GPIO Lib for Raspberry Pi
Created March 2, 2016 00:15
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  1. @aaronpearce aaronpearce created this gist Jul 10, 2012.
    88 changes: 88 additions & 0 deletions PHP GPIO Lib for Raspberry Pi
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,88 @@
    <?php
    class GPIO {

    // Using BCM pin numbers.
    private $pins = ['0', '1', '4', '7', '8', '9', '10', '11', '14', '15', '17', '18', '21', '22', '23', '24', '25'];

    // exported pins for when we unexport all
    private $exportedPins = array();

    // Setup pin, takes pin number and direction (in or out)
    public function setup($pinNo, $direction) {
    // Check if valid BCM number
    if($this->isValidPin($pinNo)) {
    // if exported, unexport it first
    if($this->isExported($pinNo)) {
    $this->unexport($pinNo);
    }

    // Export pin
    file_put_contents('/sys/class/gpio/export', $pinNo);

    // if valid direction then set direction
    if($this->isValidDirection($direction)) {
    file_put_contents('/sys/class/gpio/gpio'.$pinNo.'/direction', $direction);
    }

    // Add to exported pins array
    $exportedPins[] = $pinNo;
    } else {
    echo 'Error! Not a valid pin!';
    }
    }

    public function input($pinNo) {
    if($this->isExported($pinNo)) {
    if($this->currentDirection($pinNo) != "out") {
    return file_get_contents('/sys/class/gpio/gpio'.$pinNo.'/value');
    } else {
    echo 'Error! Wrong Direction for this pin!';
    }
    }
    }

    // Value == 1 or 0, where 1 = on, 0 = off
    public function output($pinNo, $value) {
    if($this->isExported($pinNo)) {
    if($this->currentDirection($pinNo) != "in") {
    file_put_contents('/sys/class/gpio/gpio'.$pinNo.'/value', $value);
    } else {
    echo 'Error! Wrong Direction for this pin! Meant to be out while it is ' . $this->currentDirection($pinNo);
    }
    }
    }

    public function unexport($pinNo) {
    if($this->isExported($pinNo)) {
    file_put_contents('/sys/class/gpio/unexport', $pinNo);
    foreach ($this->exportedPins as $key => $value) {
    if($value == $pinNo) unset($key);
    }
    }
    }

    public function unexportAll() {
    foreach ($this->exportedPins as $key => $pinNo) file_put_contents('/sys/class/gpio/unexport', $pinNo);
    $this->exportedPins = array();
    }

    // Check if exported
    public function isExported($pinNo) {
    return file_exists('/sys/class/gpio/gpio'.$pinNo);
    }

    public function currentDirection($pinNo) {
    return file_get_contents('/sys/class/gpio/gpio'.$pinNo.'/direction');
    }

    // Check for valid direction, in or out
    public function isValidDirection($direction) {
    return (($direction == "in") || ($direction == "out"));
    }

    // Check for valid pin
    public function isValidPin($pinNo) {
    return in_array($pinNo, $this->pins);
    }
    }
    ?>