background.php

<?php
$s = __FILE__;
$l = __DIR__.'/tmp.log';
$p = __DIR__.'/tmp.pid';
$z=$c=$r=null;

if (in_array('bg',$argv)) {
	file_put_contents($p,getmypid());
	die;
}

if (file_exists($l)) {
	$c = fopen($l, 'r');
	$z = filesize($l);
	$r = fread($c,$z);
	fclose($c);
	unset($c);
}

$x = exec("/usr/bin/nohup /usr/bin/php ${s} bg > ${f} 2>&1 &");
var_dump($z,$r,$c,$l,$s,$x);