system/helpers/file_helper.php

<?php  if (!defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 4.3.2 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine Dev Team
 * @copyright	Copyright (c) 2006, EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */

// ------------------------------------------------------------------------

/**
 * CodeIgniter File Helpers
 *
 * @package		CodeIgniter
 * @subpackage	Helpers
 * @category	Helpers
 * @author		ExpressionEngine Dev Team
 * @link		http://codeigniter.com/user_guide/helpers/file_helpers.html
 */

// ------------------------------------------------------------------------

/**
 * Read File
 *
 * Opens the file specfied in the path and returns it as a string.
 *
 * @access	public
 * @param	string	path to file
 * @return	string
 */	
if (! function_exists('read_file'))
{
	function read_file($file)
	{
		if ( ! file_exists($file))
		{
			return FALSE;
		}
	
		if (function_exists('file_get_contents'))
		{
			return file_get_contents($file);		
		}

		if ( ! $fp = @fopen($file, 'rb'))
		{
			return FALSE;
		}
		
		flock($fp, LOCK_SH);
	
		$data = '';
		if (filesize($file) > 0)
		{
			$data =& fread($fp, filesize($file));
		}

		flock($fp, LOCK_UN);
		fclose($fp);

		return $data;
	}
}
	
// ------------------------------------------------------------------------

/**
 * Write File
 *
 * Writes data to the file specified in the path.
 * Creates a new file if non-existent.
 *
 * @access	public
 * @param	string	path to file
 * @param	string	file data
 * @return	bool
 */	
if (! function_exists('write_file'))
{
	function write_file($path, $data, $mode = 'wb')
	{
		if ( ! $fp = @fopen($path, $mode))
		{
			return FALSE;
		}
		
		flock($fp, LOCK_EX);
		fwrite($fp, $data);
		flock($fp, LOCK_UN);
		fclose($fp);	

		return TRUE;
	}
}
	
// ------------------------------------------------------------------------

/**
 * Delete Files
 *
 * Deletes all files contained in the supplied directory path.
 * Files must be writable or owned by the system in order to be deleted.
 * If the second parameter is set to TRUE, any directories contained
 * within the supplied base directory will be nuked as well.
 *
 * @access	public
 * @param	string	path to file
 * @param	bool	whether to delete any directories found in the path
 * @return	bool
 */	
if (! function_exists('delete_files'))
{
	function delete_files($path, $del_dir = FALSE, $level = 0)
	{	
		// Trim the trailing slash
		$path = preg_replace("|^(.+?)/*$|", "\\1", $path);
		
		if ( ! $current_dir = @opendir($path))
			return;
	
		while(FALSE !== ($filename = @readdir($current_dir)))
		{
			if ($filename != "." and $filename != "..")
			{
				if (is_dir($path.'/'.$filename))
				{
					delete_files($path.'/'.$filename, $del_dir, $level + 1);
				}
				else
				{
					unlink($path.'/'.$filename);
				}
			}
		}
		@closedir($current_dir);
	
		if ($del_dir == TRUE AND $level > 0)
		{
			@rmdir($path);
		}
	}
}

// ------------------------------------------------------------------------

/**
 * Get Filenames
 *
 * Reads the specified directory and builds an array containing the filenames.  
 * Any sub-folders contained within the specified path are read as well.
 *
 * @access	public
 * @param	string	path to source
 * @param	bool	whether to include the path as part of the filename
 * @return	array
 */	
if (! function_exists('get_filenames'))
{
	function get_filenames($source_dir, $include_path = FALSE)
	{
		$_filedata = array();
	
		if ($fp = @opendir($source_dir))
		{
			while (FALSE !== ($file = readdir($fp)))
			{
				if (@is_dir($source_dir.$file) && substr($file, 0, 1) != '.')
				{
					 get_filenames($source_dir.$file."/", $include_path);
				}
				elseif (substr($file, 0, 1) != ".")
				{
			
					$_filedata[] = ($include_path == TRUE) ? $source_dir.$file : $file;
				}
			}
			return $_filedata;
		}
	}
}

// --------------------------------------------------------------------

?>