<?php 
  header('content-type:text/html;charset=utf-8' ); 
   
  // 必須加載擴(kuò)展 
  if (!function_exists("pcntl_fork")) { 
    die("pcntl extention is must !"); 
  } 
  //總進(jìn)程的數(shù)量 
  $totals = 3; 
  // 執(zhí)行的腳本數(shù)量 
  $cmdArr = array(); 
  // 執(zhí)行的腳本數(shù)量的數(shù)組 
  for ($i = 0; $i < $totals; $i++) { 
    $cmdArr[] = array("path" => __DIR__ . "/run.php", 'pid' =>$i ,'total' =>$totals); 
  } 
   
  /* 
  展開：$cmdArr 
  Array 
  ( 
    [0] => Array 
      ( 
        [path] => /var/www/html/company/pcntl/run.php 
        [pid] => 0 
        [total] => 3 
      ) 
   
    [1] => Array 
      ( 
        [path] => /var/www/html/company/pcntl/run.php 
        [pid] => 1 
        [total] => 3 
      ) 
   
    [2] => Array 
      ( 
        [path] => /var/www/html/company/pcntl/run.php 
        [pid] => 2 
        [total] => 3 
      ) 
   
  ) 
  */ 
   
  pcntl_signal(SIGCHLD, SIG_IGN); //如果父進(jìn)程不關(guān)心子進(jìn)程什么時(shí)候結(jié)束,子進(jìn)程結(jié)束后，內(nèi)核會回收。 
  foreach ($cmdArr as  $cmd) { 
    $pid = pcntl_fork();  //創(chuàng)建子進(jìn)程 
    //父進(jìn)程和子進(jìn)程都會執(zhí)行下面代碼 
    if ($pid == -1) { 
      //錯誤處理：創(chuàng)建子進(jìn)程失敗時(shí)返回-1. 
      die('could not fork'); 
    } else if ($pid) { 
      //父進(jìn)程會得到子進(jìn)程號，所以這里是父進(jìn)程執(zhí)行的邏輯 
      //如果不需要阻塞進(jìn)程，而又想得到子進(jìn)程的退出狀態(tài)，則可以注釋掉pcntl_wait($status)語句，或?qū)懗桑?
      pcntl_wait($status,WNOHANG); //等待子進(jìn)程中斷，防止子進(jìn)程成為僵尸進(jìn)程。 
    } else { 
      //子進(jìn)程得到的$pid為0, 所以這里是子進(jìn)程執(zhí)行的邏輯。 
      $path  = $cmd["path"]; 
      $pid = $cmd['pid'] ; 
      $total = $cmd['total'] ; 
      echo exec("/usr/bin/php {$path} {$pid} {$total}")."\n"; 
      exit(0) ; 
    } 
  } 
  ?> 

<?php
declare(ticks = 1);
 
function signal_handler($signal) {
  print "Caught SIGALRM\n";
  pcntl_alarm(5);
}
 
pcntl_signal(SIGALRM, "signal_handler", true);
pcntl_alarm(5);
 
for(;;) {
}
 
?>

<?php
$dir = '/home/shankka/';
$cmd = 'ls';
$option = '-l';
$pathtobin = '/bin/ls';
 
$arg = array($cmd, $option, $dir);
 
pcntl_exec($pathtobin, $arg);
echo '123';  //不會執(zhí)行到該行
?>

<?php
$pid = pcntl_fork();
//這里最好不要有其他的語句
if ($pid == -1) {
  die('could not fork');
} else if ($pid) {
  // we are the parent
pcntl_wait($status); //Protect against Zombie children
} else {
  // we are the child
}
?>

<?php
$pid = pcntl_fork();
if($pid) {
  pcntl_wait($status);
  $id = getmypid();
  echo "parent process,pid {$id}, child pid {$pid}\n";
}else{
  $id = getmypid();
  echo "child process,pid {$id}\n";
  sleep(2);
}
?>

<?php
/**
* Project: Signfork: php多線程庫
* File:  Signfork.class.php
*/
 
class Signfork{
 /**
  * 設(shè)置子進(jìn)程通信文件所在目錄
  * @var string
  */
 private $tmp_path='/tmp/';
 
/**
 * Signfork引擎主啟動方法
 * 1、判斷$arg類型,類型為數(shù)組時(shí)將值傳遞給每個(gè)子進(jìn)程;類型為數(shù)值型時(shí),代表要創(chuàng)建的進(jìn)程數(shù).
 * @param object $obj 執(zhí)行對象
 * @param string&#124;array $arg 用于對象中的__fork方法所執(zhí)行的參數(shù)
 * 如:$arg,自動分解為:$obj->__fork($arg[0])、$obj->__fork($arg[1])...
 * @return array 返回  array(子進(jìn)程序列=>子進(jìn)程執(zhí)行結(jié)果);
 */
 public function run($obj,$arg=1){
  if(!method_exists($obj,'__fork')){
   exit("Method '__fork' not found!");
  }
 
  if(is_array($arg)){
   $i=0;
   foreach($arg as $key=>$val){
    $spawns[$i]=$key;
    $i++;
    $this->spawn($obj,$key,$val);
   }
   $spawns['total']=$i;
  }elseif($spawns=intval($arg)){
   for($i = 0; $i < $spawns; $i++){
    $this->spawn($obj,$i);
   }
  }else{
   exit('Bad argument!');
  }
 
  if($i>1000) exit('Too many spawns!');
   return $this->request($spawns);
  }
 
 /**
  * Signfork主進(jìn)程控制方法
  * 1、$tmpfile 判斷子進(jìn)程文件是否存在，存在則子進(jìn)程執(zhí)行完畢，并讀取內(nèi)容
  * 2、$data收集子進(jìn)程運(yùn)行結(jié)果及數(shù)據(jù)，并用于最終返回
  * 3、刪除子進(jìn)程文件
  * 4、輪詢一次0.03秒，直到所有子進(jìn)程執(zhí)行完畢，清理子進(jìn)程資源
  * @param string&#124;array $arg 用于對應(yīng)每個(gè)子進(jìn)程的ID
  * @return array 返回  array([子進(jìn)程序列]=>[子進(jìn)程執(zhí)行結(jié)果]);
  */
  private function request($spawns){
   $data=array();
   $i=is_array($spawns)?$spawns['total']:$spawns;
   for($ids = 0; $ids<$i; $ids++){
    while(!($cid=pcntl_waitpid(-1, $status, WNOHANG)))usleep(30000);
    $tmpfile=$this->tmp_path.'sfpid_'.$cid;
    $data[$spawns['total']?$spawns[$ids]:$ids]=file_get_contents($tmpfile);
    unlink($tmpfile);
   }
   return $data;
  }
 
/**
 * Signfork子進(jìn)程執(zhí)行方法
 * 1、pcntl_fork 生成子進(jìn)程
 * 2、file_put_contents 將'$obj->__fork($val)'的執(zhí)行結(jié)果存入特定序列命名的文本
 * 3、posix_kill殺死當(dāng)前進(jìn)程
 * @param object $obj    待執(zhí)行的對象
 * @param object $i        子進(jìn)程的序列ID，以便于返回對應(yīng)每個(gè)子進(jìn)程數(shù)據(jù)
 * @param object $param 用于輸入對象$obj方法'__fork'執(zhí)行參數(shù)
 */
 private function spawn($obj,$i,$param=null){
  if(pcntl_fork()===0){
   $cid=getmypid();
   file_put_contents($this->tmp_path.'sfpid_'.$cid,$obj->__fork($param));
   posix_kill($cid, SIGTERM);
   exit;
  }
 }
}
?>

<?php
//.....
//需要安裝pcntl的php擴(kuò)展，并加載它
if(function_exists("pcntl_fork")){
  //生成子進(jìn)程
 $pid = pcntl_fork();
 if($pid == -1){
  die('could not fork');
 }else{
  if($pid){
   $status = 0;
   //阻塞父進(jìn)程，直到子進(jìn)程結(jié)束，不適合需要長時(shí)間運(yùn)行的腳本，可使用pcntl_wait($status, 0)實(shí)現(xiàn)非阻塞式
   pcntl_wait($status);
   // parent proc code
   exit;
  }else{
   // child proc code
   //結(jié)束當(dāng)前子進(jìn)程，以防止生成僵尸進(jìn)程
   if(function_exists("posix_kill")){
    posix_kill(getmypid(), SIGTERM);
   }else{
    system('kill -9'. getmypid());
   }
   exit;
  }
 }
}else{
  // 不支持多進(jìn)程處理時(shí)的代碼在這里
}
//.....
?>
如果不需要阻塞進(jìn)程，而又想得到子進(jìn)程的退出狀態(tài)，則可以注釋掉pcntl_wait($status)語句，或?qū)懗桑?
 
<?php
pcntl_wait($status, 1);
//或
pcntl_wait($status, WNOHANG);
?>

<?php
pcntl_signal(SIGCHLD, SIG_IGN);
$pid = pcntl_fork();
//....code
?>

#include "apue.h"
#include <sys/wait.h>
 
int main(void){
pid_t  pid;
 
if ((pid = fork()) < 0){
  err_sys("fork error");
} else if (pid == 0){   /**//* first child */
 if ((pid = fork()) < 0){
   err_sys("fork error");
 }elseif(pid > 0){
   exit(0);  /**//* parent from second fork == first child */
 }
 
 /**
  * We're the second child; our parent becomes init as soon
  * as our real parent calls exit() in the statement above.
  * Here's where we'd continue executing, knowing that when
  * we're done, init will reap our status.
  */
  sleep(2);
  printf("second child, parent pid = %d ", getppid());
  exit(0);
}
 
if (waitpid(pid, NULL, 0) != pid) /**//* wait for first child */
 err_sys("waitpid error");
 
/**
 * We're the parent (the original process); we continue executing,
 * knowing that we're not the parent of the second child.
 */
 exit(0);
}

<?php
//.....
//需要安裝pcntl的php擴(kuò)展，并加載它
if(function_exists("pcntl_fork")){
 //生成第一個(gè)子進(jìn)程
$pid = pcntl_fork(); //$pid即所產(chǎn)生的子進(jìn)程id
if($pid == -1){
 //子進(jìn)程fork失敗
 die('could not fork');
}else{
 if($pid){
  //父進(jìn)程code
  sleep(5); //等待5秒
  exit(0); //或$this->_redirect('/');
 }else{
  //第一個(gè)子進(jìn)程code
  //產(chǎn)生孫進(jìn)程
  if(($gpid = pcntl_fork()) < 0){ ////$gpid即所產(chǎn)生的孫進(jìn)程id
   //孫進(jìn)程產(chǎn)生失敗
   die('could not fork');
  }elseif($gpid > 0){
   //第一個(gè)子進(jìn)程code，即孫進(jìn)程的父進(jìn)程
   $status = 0;
   $status = pcntl_wait($status); //阻塞子進(jìn)程,并返回孫進(jìn)程的退出狀態(tài)，用于檢查是否正常退出
   if($status ! = 0) file_put_content('filename', '孫進(jìn)程異常退出');
   //得到父進(jìn)程id
   //$ppid = posix_getppid(); //如果$ppid為1則表示其父進(jìn)程已變?yōu)閕nit進(jìn)程，原父進(jìn)程已退出
   //得到子進(jìn)程id：posix_getpid()或getmypid()或是fork返回的變量$pid
   //kill掉子進(jìn)程
   //posix_kill(getmypid(), SIGTERM);
   exit(0);
  }else{ //即$gpid == 0
   //孫進(jìn)程code
   //....
   //結(jié)束孫進(jìn)程(即當(dāng)前進(jìn)程)，以防止生成僵尸進(jìn)程
   if(function_exists('posix_kill')){
     posix_kill(getmypid(), SIGTERM);
   }else{
     system('kill -9'. getmypid());
   }
   exit(0);
  }
 }
}
}else{
 // 不支持多進(jìn)程處理時(shí)的代碼在這里
}
//.....
?>

<?php
//Action代碼
public function createAction(){
  //....
  //將args替換成要傳給insertLargeData.php的參數(shù)，參數(shù)間用空格間隔
  system('php -f insertLargeData.php ' . ' args ' . '&');
  $this->redirect('/');
}
?>

<?php
//Action代碼
public function createAction(){
  //....
  //將args替換成要傳給insertLargeData.php的參數(shù)，參數(shù)間用空格間隔
  system('nohup php -f insertLargeData.php ' . ' args ' . '&');
  $this->redirect('/');
}
?>