PHP pcntl multi-process usage example_PHP tutorial

Examples of pcntl multi-process usage in PHP

This article mainly introduces the usage of pcntl multi-process in PHP. The example analyzes the usage skills of pcntl operating multi-process, which is of great practical value. , friends in need can refer to it

The example in this article describes the usage of PHP's pcntl multi-process. Share it with everyone for your reference. The specific analysis is as follows:

PHP can also process a transaction using multiple processes using the PCNTL series of functions. For example, I need to obtain 800,000 pieces of data from the database and then do a series of subsequent processing. At this time, should I use a single process? You can wait until today next year. So you should use the pcntl function.

Suppose I want to start 20 processes and divide 1-80w of data into 20 parts. The main process waits for all child processes to finish before exiting:

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$max = 800000; $workers = 20; $pids = array(); for($i = 0; $i < $workers; $i ){ $pids[$i] = pcntl_fork(); switch ($pids[$i]) { case -1: echo "fork error : {$i} rn"; exit; case 0: $param = array( 'lastid' => $max / $workers * $i, 'maxid' => $max / $workers * ($i 1), ); $this->executeWorker($input, $output, $param); exit; default: break; } } foreach ($pids as $i => $pid) { if($pid) { pcntl_waitpid($pid, $status); } }

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$max = 800000; $workers = 20; $pids = array(); for($i = 0; $i < $workers; $i ){<🎜> <🎜>$pids[$i] = pcntl_fork();<🎜> <🎜>switch ($pids[$i]) {<🎜> <🎜>case -1:<🎜> <🎜>echo "fork error : {$i} rn";<🎜> <🎜>exit;<🎜> <🎜>case 0:<🎜> <🎜>$param = array(<🎜> <🎜>'lastid' => $max / $workers * $i,<🎜> <🎜>'maxid' => $max / $workers * ($i 1),<🎜> <🎜>);<🎜> <🎜>$this->executeWorker($input, $output, $param); exit; default: break; } } foreach ($pids as $i => $pid) { if($pid) { pcntl_waitpid($pid, $status); } }

When pcntl_fork comes out, a pid value will be returned. This pid is 0 in the child process, and is the pid of the child process in the parent process (>0). If the pid is -1, it means that the fork went wrong. . Use a $pids array to let the main process wait for all processes to complete before ending I hope this article will be helpful to everyone’s PHP programming design. http://www.bkjia.com/PHPjc/970755.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/970755.htmlTechArticlePHP’s pcntl multi-process usage example This article mainly introduces PHP’s pcntl multi-process usage, and the example analyzes pcntl The tips for operating multiple processes are of great practical value. Friends who need them can...