How can developers troubleshoot issues with shell_exec() not working as expected in PHP scripts for file extraction tasks?

If shell_exec() is not working as expected in PHP scripts for file extraction tasks, developers can troubleshoot the issue by checking the permissions of the PHP script and the files involved, verifying that the necessary shell commands are available on the server, and ensuring that the correct path to the shell commands is used in the script. Additionally, developers can use error handling techniques such as checking the return value of shell_exec() and using functions like exec() or system() for more control over the command execution.

// Example PHP code snippet for troubleshooting shell_exec() not working for file extraction tasks

// Check if shell_exec() is enabled
if (function_exists('shell_exec')) {
    // Check the permissions of the PHP script and files involved
    $output = shell_exec('ls -l /path/to/files');
    echo $output;
} else {
    echo 'shell_exec() is not enabled on this server';
}