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How to run a php script in background

Run PHP Codes in Linux Command LineWhen we need to run some script without waiting the fronted user till the process is not completed, For that we need to execute some script in background to hiding the execution time to user.This process is hidden to the end user. It improves your Website efficiency.

The concept, In LINUX there is a shell script which is used to run the process in background. You can put a task (such as command or script) in a background by appending a & at the end of the command line. The & operator puts command in the background and free up your terminal. The command which runs in background is called a job. You can type other command while background command is running.

Are you sure the script doesn’t contain any errors? This is what normally makes “execution terminates very quickly“.
First, append:

error_reporting(E_ALL); ini_set('display_errors', 1);

at the top of your script to display any errors it may have, then you can use:

nohup php filename.php &

nohup runs a command even if the session is disconnected or the user logs out.

OR

nohup php filename.php >/dev/null 2>&1 &

Same as above but doesn’t create nohup.out file.


You can also use:
ignore_user_abort(1);

Set whether a client disconnect should abort script execution

set_time_limit(0);

Limits the script maximum execution time, in this case it will run until the process finishes or the apache process restarts.


Notes

The php and the filename.php paths may be provided as a full-path, instead of php and filename.php, you can use /usr/bin/php and /full/path/to/filename.php.
Full Path is recommended to avoid file not found errors.

Syntax : {command} &
Example: ls -l & exec php index.php > /dev/null 2>&1 & echo $

How to check the background process in Linux?

ps -l (list all process)
ps -ef (all full details of process)

What is the command to execute a php script in background?

Syntax: nohup exec arg1 arg2 > /dev/null &
Example: nohup exec php process.php hello world > /dev/null &

What is nohup?

Most of the time you log-in into remote server via ssh. If you start a shell script or command and you exit (abort remote connection), the process / command will get killed. Sometime job or command takes a long time. If you are not sure when the job will finish, then it is better to leave job running in background. But, if you log out of the system, the job will be stopped and terminated by your shell.

what do you do to keep job running in the background when process gets SIGHUP?

What is exec?

This command is used to execute a process in Linux. It can process one or more process at a time.

How to use this PHP library on your code?

Step 1: create two file name index.php and process.php

step 2: include the PHPBackgroundProcesser.php file in the index.php

step 3: create a instance of the class BackgroundProcess

We can use this:

Type 1:

$proc=new BackgroundProcess('exec php <BASE_PATH>/process.php hello world');

Type 2:

$proc=new BackgroundProcess();
$proc->setCmd('exec php <BASE_PATH>/process.php hello world');
$proc->start();

Type 3:

$proc=new BackgroundProcess();
$proc->setCmd('exec php <BASE_PATH>/process.php hello world')->start();

Alternatively you can execute PHP URL in background with out the direct (.php) file

$process=new BackgroundProcess("curl -s -o <Base Path>/log/log_storewav.log <PHP URL to execute> -d param_key=<Param_value>");

How to get all process which is running?

$proc=new BackgroundProcess();
print_r($proc->showAllPocess());

How to kill a process ?

$proc=new BackgroundProcess();
$proc->setProcessId(101)->stop(); //set the process id.

source    author :Sanjay Panda

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