PHP Multi-process implementation

PHP Multi-process implementation

PHP has a set of process control functions (–ENABLE-PCNTL and POSIX extensions are required at compile time), which enables PHP to create sub-processes like C in the Nginx system, execute programs using the EXEC function, and process signals.

CentOS 6 under the Yum install PHP, the default is not to install PCNTL, so you need to compile the installation separately, first download the corresponding version of PHP, after decompression

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1. CD Php-version/ext/pcntl
2. Phpize
3. ./configure && make && make install
4. Cp/usr/lib/php/modules/pcntl.so/usr/lib64/php/modules/pcntl.so
5. echo "extension=pcntl.so" >>/etc/php.ini
6. /ETC/INIT.D/HTTPD restart

It's very convenient.

Here is the sample code:

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2. <?php
4. Header (' Content-type:text/html;charset=utf-8 ');
8. Extension must be loaded
10. if (!function_exists ("Pcntl_fork")) {
12. Die ("Pcntl extention is must!");
14. }
16. The number of total processes
18. $totals = 3;
20. Number of scripts executed
22. $CMDARR = Array ();
24. An array of the number of scripts executed
26. for ($i = 0; $i < $totals; $i + +) {  
28. $CMDARR [] = Array ("path" = = __dir__.  "/run.php", ' pid ' =$i,' total ' =$totals);
30. }
34. /*
36. Expand: $CMDARR
38. Array
40. (
42. [0] = = Array
44. (
46. [Path] =/var/www/html/company/pcntl/run.php
48. [PID] = 0
50. [Total] = 3
52. )
56. [1] = = Array
58. (
60. [Path] =/var/www/html/company/pcntl/run.php
62. [PID] = 1
64. [Total] = 3
66. )
70. [2] = = Array
72. (
74. [Path] =/var/www/html/company/pcntl/run.php
76. [PID] = 2
78. [Total] = 3
80. )
84. )
86. */
90. Pcntl_signal (SIGCHLD, sig_ign);  //If the parent process does not care what time the child process ends, the kernel is reclaimed after the child process is finished.
92. foreach ($cmdArr as $cmd) {
94. $pid = Pcntl_fork (); //Create child process
96. //parent and child processes will execute the following code
98. if ($pid = =-1) {
100. //Error handling: Returns 1 when creating a child process failure.
102. Die (' could not fork ');
104. } Else if ($pid) {
106. //Parent process will get the child process number, so here is the logic that the parent process executes
108. //If you do not need to block the process and want the exit status of the child process, you can comment out the pcntl_wait ($status) statement, or write:
110. Pcntl_wait ($status, Wnohang);  //Wait for the child process to break to prevent the child process from becoming a zombie process.
112. } Else {
114. //Sub-process gets a $pid of 0, so here is the logic that the child process executes.
116. $path = $cmd ["path"];
118. $pid = $cmd [' pid '];
120. $total = $cmd [' Total '];
122. echo exec ("/usr/bin/php {$path} {$pid} {$total}")."  \ n ";
124. exit (0);
126. }
128. }
130. ?>

PHP Multi-process implementation