VZ/PHP/DS18B20/Raspi

w1vz.php

<?php
	if (! function_exists('pcntl_fork')) die('PCNTL functions not available on this PHP installation');
	
	$mapping = array(
		'000002386cd3' => 'da68e010-df8f-11e3-8d00-af6cb310cad1',
		'0000023882e5' => 'e172e220-df8f-11e3-8e0d-7d816ca63379',
		'00000238a7bd' => 'e5df5840-df8f-11e3-942a-6d89eca9798f'
	);
	$middleware = 'http://192.168.101.109/middleware.php';
	$maxforks = 10;
 
	
	$forks = 0;
 
	while(true) {
		foreach($mapping as $s_1w => $s_uuid) {
			if($forks >= $maxforks) {
				pcntl_wait($status);
				$forks--;
			}
			$pid[$s_1w] = pcntl_fork();
			if($pid[$s_1w] == -1) trigger_error('Could not fork', E_USER_WARNING);
			if($pid[$s_1w] == 0) {
				readSensor($s_1w, $s_uuid);
				exit(0);
			}
			if($pid[$s_1w] > 0) {
				$forks++;
			}
		}
 
		foreach($mapping as $s_1w => $s_uuid) {
			pcntl_waitpid($pid[$s_1w], $status);
		}
		$forks = 0;
		sleep(10);
	}
 
 
 
	function readSensor($s_1w, $s_uuid) {
		global $middleware;
 
		if(!file_exists('/sys/bus/w1/devices/28-'.$s_1w.'/w1_slave')) {
			echo 'Sensor 28-'.$s_1w.' not found'."\n";
			return -2;
		}

		$s_wert = file_get_contents('/sys/bus/w1/devices/28-'.$s_1w.'/w1_slave');

		if(strpos($s_wert, ' YES') === false) {
			echo 'Sensor 28-'.$s_1w.' - checksum incorrect'."\n";
			return -1;
		}

		if(preg_match('/t=(\-?\d+)$/', $s_wert, $match)) {
			$temp = $match[1]/1000;
			echo 'Sensor 28-'.$s_1w.' @ '.$temp.'°C'."\n";
			if($temp == 85) {
				echo 'Oops… Looks like a read error - ignoring value…'."\n";
			}else{
				file_get_contents($middleware.'/data/'.$s_uuid.'.json?operation=add&value='.$temp);
			}
			unset($temp);
		}else{
			echo 'Sensor 28-'.$s_1w.' - can not interpret data'."\n";
			return -3;
		}
 
	}
?>