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function phpbb_chmod($filename, $perms = CHMOD_READ) 

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* @param $filename The file/directory to be chmodded
* @param $perms Permissions to set
* @return true on success, otherwise false
*
* @author faw, phpBB Group
*/
function phpbb_chmod($filename, $perms = CHMOD_READ)
{
	// Return if the file no longer exists.
	if (!file_exists($filename))
	{
		return false;
	}

	if (!function_exists('fileowner') || !function_exists('filegroup'))
	{
		$file_uid = $file_gid = false;
		$common_php_owner = $common_php_group = false;
	}
	else
	{
		global $phpbb_root_path, $phpEx;

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	/**
	* Save modified objects
	*/
	function save()
	{
		if (!$this->is_modified)
		{
			return;
		}

		global $phpEx;

		if ($fp = @fopen($this->cache_dir . 'data_global.' . $phpEx, 'wb'))
		{
			@flock($fp, LOCK_EX);
			fwrite($fp, "<?php\n\$this->vars = " . var_export($this->vars, true) . ";\n\n\$this->var_expires = " . var_export($this->var_expires, true) . "\n?>");
			@flock($fp, LOCK_UN);
			fclose($fp);

			phpbb_chmod($this->cache_dir . 'data_global.' . $phpEx, CHMOD_WRITE);
		}
		else
		{
			// Now, this occurred how often? ... phew, just tell the user then...
			if (!@is_writable($this->cache_dir))
			{
				trigger_error($this->cache_dir . ' is NOT writable.', E_USER_ERROR);
			}

			trigger_error('Not able to open ' . $this->cache_dir . 'data_global.' . $phpEx, E_USER_ERROR);
		}

		$this->is_modified = false;
	}