php Swftools class class Swftools_Core default configuration protected

<?php
/**
* Swftools class.
*/
class Swftools_Core
{
	
	//default configuration
	
	protected $config = array(
		'pdf2swf' => 'pdf2swf', //default value for *nix system
		'png2swf' => 'png2swf', //default value for *nix system
		'gif2swf' => 'gif2swf', //default value for *nix system
		'jpeg2swf' => 'jpeg2swf', //default value for *nix system
		'path_to_players' => null,
		'livepath_to_players' => null,
		'player' => 'default',
		'allowed_domain' => null
		);
	
	/**
	 * Handle pdf2swf, jpeg2swf, png2swf, gif2swf functions
	 * @param 	mixed
	 * @return  bool
	 */
	
	public function __call($func, $vars = array())
	{
		switch ($func) {
			case 'pdf2swf':
				if (is_array($vars[0])) {
					$vars[0] = $vars[0][0];
				} else {
					$vars[0] = array($vars[0]);
				}
				return $this->convert($func, $vars[0], $vars[1], isset($vars[2]) ? $vars[2] : null, isset($vars[3]) ? $vars[3] : null);
				break;
			case 'png2swf':
			case 'jpeg2swf':
			case 'gif2swf':
				if (!is_array($vars[0])) {
					$vars[0] = array($vars[0]);
				}
				return $this->convert($func, $vars[0], $vars[1]);
				break;
		}
	}
	
	/**
	 * Reload base configurations
	 * @param   array 	Example: array('param_name' => 'param_value')
	 * @return  bool 
	 */
	
	public function init($c = array())
	{
		if (empty($c)) {
			$this->log('Configuration is empty.');
			return false;
		};
		
		foreach ($c as $k => $v) {
			if (!empty($v)) $this->config[$k] = $v;
		}
		return true;
	}
	
	/**
	 * Convert array of source files to swf document
	 *
	 * @param   string	Converter(pdf2swf, jpeg2swf, png2swf, gif2swf)
	 * @param   array   Files for convertation
	 * @param   int		Start page, for pdf only
	 * @param   int		End page, for pdf only
	 * @return  bool
	 */
	
	private function convert($converter = null, $source_files = array(), $swf_file = null, $start_page = null, $end_page = null)
	{
		if (count($source_files) < 1) {
			$this->log('No source files.');
			return false;
		}
		$str_source_files = '';
		
		foreach ($source_files as $source_file) {
			if (is_file($source_file)) {
				$str_source_files .= ' "'.$source_file.'" ';
			} else {
				$this->log('Wrong source file(s).');
				return false;
			}
		}
		
		$str = $this->config[$converter] . ' ' // pdf2swf command
		. ((!is_null($start_page)&&!is_null($end_page)) ? '-p ' . (int)$start_page . '-' . (int)$end_page . ' ' : '') // pages range
		. ' -o "' . $swf_file .'" ' // output swf-file
		. $str_source_files; // source files
		
		
		exec($str);
		
		if (!is_file($swf_file)) {
			$this->log('Convertation errors.');
			return false;
		}
		
		return true;
	}
	
	/**
	 * Retrieve a html code with swf player.
	 *
	 * @param   string	Correct URL of swf file
	 */
	
	public function render($swf = null)
	{
		if (is_null($swf)) {
			$this->log('Wrong swf-file.');
			return false;
		}
		
		$c = $this->config;
		
		//read template from file
		$template = file_get_contents($this->config['path_to_players'] . DIRECTORY_SEPARATOR . $this->config['player'] . '.html');
		
		//init some template vars
		$c['livepath_to_player'] = $c['livepath_to_players'] . '/' . $c['player'] . '.swf';
		
		$c['flash_vars'] = 'allowed_domain=' . urlencode($c['allowed_domain'])
			. '&swf=' . urlencode($swf);
		
		
		// render template vars, replace {{var}} by $c['var'], where $c = $config + (some vars)
		if (!empty($c))
			foreach ($c as $k => $v) {
				$template = str_replace('{{'.$k.'}}', $v, $template);
			}
		
		return $template;
	}
	
	/**
	 * Base log function
	 *
	 * @param   string	Message
	 */
	protected function log($msg)
	{
		ob_start();
	    debug_print_backtrace ();
	    $trace .= ob_get_contents();
	    ob_end_clean();
	    
	    $msg = $msg . "\n" . $trace;
	    
		error_log($msg, 0);
		
		return $msg;
	}
}


?>