PHP脚本后台运行

error_reporting(E_ALL);

if(!function_exists('ignore_user_abort')){
	exit('Function ignore_user_abort is not exists!');
}

if(!function_exists('set_time_limit')){
	exit('Function set_time_limit is not exists!');
}

ignore_user_abort(true);
set_time_limit(0);

while(1 == 1){

	if(file_exists('close.txt')){
		exit();
	}

	$ch = curl_init();
	curl_setopt($ch, CURLOPT_URL, 'http://www.baidu.com');
	curl_setopt($ch, CURLOPT_HEADER, 0);
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
	$result = curl_exec($ch);
	curl_close($ch);

	// file_put_contents(time().'_'.memory_get_usage().'.txt', '');
	
	$memory = memory_get_usage();
	
	if($memory > 20*1024*1024){
		exit();
	}

	sleep(2);

}