在PHP中有这么一族函数,他们是对UNIX的V IPC函数族的包装。
它们很少被人们用到,然则它们却很壮大。奇妙的应用它们,能够让你事半功倍。
它们包含:
信号量(Semaphores)
同享内存(Shared Memory)
历程间通讯(Inter-Process Messaging, IPC)
基于这些,我们完整有能够将PHP包装成一基于音讯驱动的体系。
然则,起首,我们须要引见几个主要的基础:
1. ftok
int ftok ( string pathname, string proj ) //ftok将一个路径名pathname和一个项目名(必需为一个字符), 转化成一个整形的用来运用体系V IPC的key
2. ticks
Ticks是从PHP 4.0.3最先才加入到PHP中的,它是一个在declare代码段中诠释器每实行N条初级语句就会发作的事宜。N的值是在declare中的directive部分用ticks=N来指定的。
function getStatus($arg){ print_r connection_status(); debug_print_backtrace(); } reigster_tick_function("getStatus", true); declare(ticks=1){ for($i =1; $i<999; $i++){ echo "hello"; } } unregister_tick_function("getStatus");
这个就基础相当于:
function getStatus($arg){ print_r connection_status(); debug_print_backtrace(); } reigster_tick_function("getStatus", true); declare(ticks=1){ for($i =1; $i<999; $i++){ echo "hello"; getStatus(true); } } unregister_tick_function("getStatus");
音讯,我现在用一个例子来申明,怎样连系Ticks来完成PHP的音讯通讯。
$mesg_key = ftok(__FILE__, 'm'); $mesg_id = msg_get_queue($mesg_key, 0666); function fetchMessage($mesg_id){ if(!is_resource($mesg_id)){ print_r("Mesg Queue is not Ready"); } if(msg_receive($mesg_id, 0, $mesg_type, 1024, $mesg, false, MSG_IPC_NOWAIT)){ print_r("Process got a new incoming MSG: $mesg "); } } register_tick_function("fetchMessage", $mesg_id); declare(ticks=2){ $i = 0; while(++$i < 100){ if($i%5 == 0){ msg_send($mesg_id, 1, "Hi: Now Index is :". $i); } } } //msg_remove_queue($mesg_id);
在这个例子中,起首将我们的PHP实行Process加入到一个由ftok生成的Key所取得的音讯行列中。
然后,经由过程Ticks,没隔俩个语句,就去查询一次音讯行列。
然后模仿了音讯发送。
在浏览器接见这个剧本,效果以下:
Process got a new incoming MSG: s:19:"Hi: Now Index is :5"; Process got a new incoming MSG: s:20:"Hi: Now Index is :10"; Process got a new incoming MSG: s:20:"Hi: Now Index is :15"; Process got a new incoming MSG: s:20:"Hi: Now Index is :20"; Process got a new incoming MSG: s:20:"Hi: Now Index is :25"; Process got a new incoming MSG: s:20:"Hi: Now Index is :30"; Process got a new incoming MSG: s:20:"Hi: Now Index is :35"; Process got a new incoming MSG: s:20:"Hi: Now Index is :40"; Process got a new incoming MSG: s:20:"Hi: Now Index is :45"; Process got a new incoming MSG: s:20:"Hi: Now Index is :50"; Process got a new incoming MSG: s:20:"Hi: Now Index is :55"; Process got a new incoming MSG: s:20:"Hi: Now Index is :60"; Process got a new incoming MSG: s:20:"Hi: Now Index is :65"; Process got a new incoming MSG: s:20:"Hi: Now Index is :70"; Process got a new incoming MSG: s:20:"Hi: Now Index is :75"; Process got a new incoming MSG: s:20:"Hi: Now Index is :80"; Process got a new incoming MSG: s:20:"Hi: Now Index is :85"; Process got a new incoming MSG: s:20:"Hi: Now Index is :90"; Process got a new incoming MSG: s:20:"Hi: Now Index is :95";
看到这里是否是,人人已对怎样模仿PHP为事宜驱动已有了一个观点了? 别急,我们继承完美。
3. 信号量
信号量的观点,人人应当都很熟习。经由过程信号量,能够完成历程通讯,合作等。 再次就不赘述了,只是简朴的列出PHP中供应的信号量函数集。
sem_acquire -- Acquire a semaphore sem_get -- Get a semaphore id sem_release -- Release a semaphore sem_remove -- Remove a semaphore
细致信息,能够翻阅PHP手册。
4. 内存同享
PHP sysvshm供应了一个内存同享计划:sysvshm,它是和sysvsem,sysvmsg一个系列的,但在此处,我并没有运用它,我运用的shmop系列函数,连系TIcks
function memoryUsage(){ printf("%s: %s<br/>", date("H:i:s", $now), memory_get_usage()); //var_dump(debug_backtrace()); //var_dump(__FUNCTION__); //debug_print_backtrace(); } register_tick_function("memoryUsage"); declare(ticks=1){ $shm_key = ftok(__FILE__, 's'); $shm_id = shmop_open($shm_key, 'c', 0644, 100); } printf("Size of Shared Memory is: %s<br/>", shmop_size($shm_id)); $shm_text = shmop_read($shm_id, 0, 100); eval($shm_text); if(!empty($share_array)){ var_dump($share_array); $share_array['id'] += 1; }else{ $share_array = array('id' => 1); } $out_put_str = "$share_array = " . var_export($share_array, true) .";"; $out_put_str = str_pad($out_put_str, 100, " ", STR_PAD_RIGHT); shmop_write($shm_id, $out_put_str, 0); ?>
运转这个例子,不停革新,我们能够看到index在递增。
单单运用这个shmop就可以完成一下,PHP剧本之间同享数据的功用:以及,比方缓存,计数等等。
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