// $filename: 文件名	// $start: 从倒数第几行开始	// $lines: 读取几行	function read_backward_line($filename, $start, $lines){	    $lines++;	    $offset = -1;	    $c = '';	    $read = '';	    $i = 0;	    $fp = @fopen($filename, "r");			    $tmpStart = 0;	    while( $lines && fseek($fp, $offset, SEEK_END) >= 0 ) {	        	        $c = fgetc($fp);	        if($c == "\n" || $c == "\r"){	            if(++$tmpStart >= $start)	                $lines--;	        }			        if($tmpStart >= $start)	            $read .= $c;	        $offset--;	    }		    $read = trim($read);			    $read = array_reverse(explode("\n",strrev($read)));	    foreach($read as $key => $value) {	        if (empty($value)) {	            unset($read[$key]);	        }	    }	    return $read;	}