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PHP multi-process problem solving_PHP tutorial
- WBOYOriginal
- 2016-07-21 15:45:20781browse
Moreover, if the input data is illegal and the script does not detect it, resulting in abort, it will also make you very unhappy.
What? What should I do?
Haha, don’t worry, multi-process will help you!
That , why is this?
Advantages:
1. When using multiple processes, after the child process ends, the kernel will be responsible for recycling resources
2. When using multiple processes, the abnormal exit of the child process will not cause the entire process Thread to exit. . The parent process still has a chance to rebuild the process.
3. A resident main process, only responsible for task distribution, the logic is clearer.
Then, how to do it?
Next, we use POSIX provided by PHP and Pcntl series functions to implement a PHP command parser. The main process is responsible for accepting user input, and then forking the sub-process to execute, and is responsible for echoing the end status of the sub-process.
The code is as follows, I have added comments, if there are any If you understand, you can read the relevant functions in the manual, or reply to the message.
#!/bin /env php
/**A example denoted muti-process application in php
* @filename fork.php
* @touch date Wed 10 Jun 2009 10:25:51 PM CST
* @author Laruence
* @license http://www.zend.com/license/3_0.txt PHP License 3.0
* @version 1.0.0
*/
/**Make sure this function can only be run in SHELL*/
if
(substr(php_sapi_name(), 0, 3) !== 'cli')
{
die("This Programe can only be run in CLI mode");
}
/**Turn off the maximum execution event limit. In CLI mode, this statement is actually unnecessary.*/
set_time_limit(0 );
$pid = posix_getpid(); //Get the main process ID
$user = posix_getlogin(); //Get the user name
echo
<<
input php code to execute by fork a new process
input quit to exit
Shell Executor version 1.0.0 by laruence
EOD;
while
(true)
{
$prompt = "n{$user}$ ";
$input = readline($prompt);
readline_add_history($input);
if
($input == 'quit')
{
break;
}
process_execute($input . ';');
}
exit(0);
function
process_execute($input)
{
$pid = pcntl_fork(); //Create sub-process
if
($pid == 0)
{//Sub-process
$pid = posix_getpid();
echo
"* Process {$pid} was created, and Executed:nn";
eval($input); //Parse command
exit ;
}
else
{//Main process
$pid = pcntl_wait($status, WUNTRACED); //Get the end status of the child process
if
(pcntl_wifexited($status ))
{
echo
"nn* Sub process: {$return['pid']} exited with {$status}";
}
}
}