Provides the command_exists() method, which will test to see if the given shell command exists.

shell_helper.php

<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');

/*
 
	|----------------------------------------------------------------
	| Description
	|----------------------------------------------------------------
 
		Provides the command_exists() method, which will test to see if
		the given shell command exists.
 
 
	|----------------------------------------------------------------
	| Dependencies
	|----------------------------------------------------------------
 
		CodeIgniter
 
 
	|----------------------------------------------------------------
	| Example Usage
	|----------------------------------------------------------------
 
 		<?php

			if (command_exists('vim'))
				echo 'yay!';
			else
				echo ':(';

		?>

			Should print the following, if vim is installed on your server:

				yay!
 
*/

function command_exists($cmd)
{
	// Clean the command.
	$cmd = str_replace(array("\0", '/', ',', ';', '|'), '', $cmd);

	$return = shell_exec('which ' . $cmd);

	return !empty($return);
}


/* End of file shell_helper.php */
/* Location: ./application/helpers/shell_helper.php */