Php multi-process implementation programming example

cd php-version/ext/pcntl 
phpize 
./configure && make && make install 
cp /usr/lib/php/modules/pcntl.so /usr/lib64/php/modules/pcntl.so 
echo "extension=pcntl.so" >> /etc/php.ini 
/etc/init.d/httpd restart

<?php 
header(&#39;content-type:text/html;charset=utf-8&#39; ); 
 
// 必须加载扩展 
if (!function_exists("pcntl_fork")) { 
 die("pcntl extention is must !"); 
} 
//总进程的数量 
$totals = 3; 
// 执行的脚本数量 
$cmdArr = array(); 
// 执行的脚本数量的数组 
for ($i = 0; $i < $totals; $i++) { 
 $cmdArr[] = array("path" => __DIR__ . "/run.php", &#39;pid&#39; =>$i ,&#39;total&#39; =>$totals); 
} 
 /* 
展开：$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); //如果父进程不关心子进程什么时候结束,子进程结束后，内核会回收。 
foreach ($cmdArr as $cmd) { 
 $pid = pcntl_fork(); //创建子进程 
 //父进程和子进程都会执行下面代码 
 if ($pid == -1) { 
  //错误处理：创建子进程失败时返回-1. 
  die(&#39;could not fork&#39;); 
 } else if ($pid) { 
  //父进程会得到子进程号，所以这里是父进程执行的逻辑 
  //如果不需要阻塞进程，而又想得到子进程的退出状态，则可以注释掉pcntl_wait($status)语句，或写成： 
  pcntl_wait($status,WNOHANG); //等待子进程中断，防止子进程成为僵尸进程。 
 } else { 
  //子进程得到的$pid为0, 所以这里是子进程执行的逻辑。 
  $path = $cmd["path"]; 
  $pid = $cmd[&#39;pid&#39;] ; 
  $total = $cmd[&#39;total&#39;] ; 
  echo exec("/usr/bin/php {$path} {$pid} {$total}")."\n"; 
  exit(0) ; 
 } 
} 
?>