Execute Shell Script using PHP (Git Pull Example)

run-command.php

<?php
// chdir to the correct directory before calling the script
//Ref: https://stackoverflow.com/questions/11052162/run-bash-command-from-php#answer-11052453
$old_path = getcwd();
chdir('/path/to/file');
//make sure to make the shell file executeable first before running the shell_exec function
$output = shell_exec('./shell-script.sh');
chdir($old_path);

echo $output;

?>     

shell-script.sh

#!/bin/bash
cd /path/to/git/folder && git pull origin branch_name