php: custom file log

log

/**
 * custom log in current directory
 * @author schurpf
 * @url        http://schurpf.com
 * @version    0.0
 * @date       2014-10-28
 * @dependency WP, needs plugin_dir_path 
 * @param      string             $log  log message
 * @param      string             $file filename
 * @return     bool               return true on success
 */
if (! function_exists('sch_log')) {
	function sch_log($log, $file_path ='', $file = 'log.txt'){ 
    		//set file path if not existing
	        if ($file_path == ''){
	        	$file_path =  dirname(__FILE__). '/' .$file;
	    	}

			//Process $log
			if ( is_array($log)){
				ob_start( );
				print_r($log);
				$log = ob_get_clean( );
			}

			//Add date and time
    		$log = date(DATE_RFC2822).PHP_EOL.$log;
    	
	        // Open the file to get existing content
	        $current = $log;
	        if (file_exists($file_path)){
	            $current = file_get_contents($file_path);
	            // Append a new person to the file
	            $current = $log."\n".$current;
	            // Write the contents back to the file
	        }
	        file_put_contents($file_path, $current);
	        
	    return TRUE;
	}
}