php-linux-gpio/examples/basic.php

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<?php
require_once __DIR__."/../vendor/autoload.php";
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/*
* This example will flash a led connected on pin 0 (GPIO17 on a Pi). If you are
* not on a Pi, please change (or remove) the mapper below and update the pin
* numbers to match.
*
*/
use NoccyLabs\Gpio\Gpio;
use NoccyLabs\Gpio\GpioMapper\WiringPiMapper;
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try {
$gpio = new Gpio();
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} catch (Gpio\Exception $e) {
error_log("Error: {$e}");
}
// The mapper translates GPIO to logical pins and vice versa
$gpio->setMapper( new WiringPiMapper(2) );
// Access logical pin 0, since we got a mapper assigned. Otherwise this would
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// be the actual GPIO0 pin.
$led = $gpio[0]
->export()
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->setEdge(Gpio::EDGE_NONE)
->setDirection(Gpio::DIR_OUT)
->setLabel("LED pin")
->setValue(0);
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// Flash the led
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$x = 0;
while(true) {
$x = (int)(!$x);
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$led->setValue($x)->dumpStatus(true);
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usleep(500000);
}