php怎么压缩一个文件夹里面所有的文件到zip文件里面

    Function ReadFileHeader($zip){        $binary_data = fread($zip, 30);        $data = unpack('vchk/vid/vversion/vflag/vcompression/vmtime/vmdate/Vcrc/Vcompressed_size/Vsize/vfilename_len/vextra_len', $binary_data);        $header['filename'] = fread($zip, $data['filename_len']);        IF($data['extra_len'] != 0){$header['extra'] = fread($zip, $data['extra_len']);}Else{$header['extra'] = '';}        $header['compression'] = $data['compression'];        $header['size'] = $data['size'];        $header['compressed_size'] = $data['compressed_size'];        $header['crc'] = $data['crc'];        $header['flag'] = $data['flag'];        $header['mdate'] = $data['mdate'];        $header['mtime'] = $data['mtime'];        IF($header['mdate'] && $header['mtime']){            $hour = ($header['mtime']&0xF800) >> 11;            $minute = ($header['mtime']&0x07E0) >> 5;            $seconde = ($header['mtime']&0x001F) * 2;            $year = (($header['mdate']&0xFE00) >> 9) + 1980;            $month = ($header['mdate']&0x01E0) >> 5;            $day = $header['mdate']&0x001F;            $header['mtime'] = mktime($hour, $minute, $seconde, $month, $day, $year);        }Else{            $header['mtime'] = time();        }        $header['stored_filename'] = $header['filename'];        $header['status'] = "ok";        Return $header;    }    Function ReadCentralFileHeaders($zip){        $binary_data = fread($zip, 46);        $header = unpack('vchkid/vid/vversion/vversion_extracted/vflag/vcompression/vmtime/vmdate/Vcrc/Vcompressed_size/Vsize/vfilename_len/vextra_len/vcomment_len/vdisk/vinternal/Vexternal/Voffset', $binary_data);        IF($header['filename_len'] != 0)            $header['filename'] = fread($zip, $header['filename_len']);        Else $header['filename'] = '';        IF($header['extra_len'] != 0)            $header['extra'] = fread($zip, $header['extra_len']);        Else $header['extra'] = '';        IF($header['comment_len'] != 0)            $header['comment'] = fread($zip, $header['comment_len']);        Else $header['comment'] = '';        IF($header['mdate'] && $header['mtime']){            $hour = ($header['mtime'] &0xF800) >> 11;            $minute = ($header['mtime'] &0x07E0) >> 5;            $seconde = ($header['mtime'] &0x001F) * 2;            $year = (($header['mdate'] &0xFE00) >> 9) + 1980;            $month = ($header['mdate'] &0x01E0) >> 5;            $day = $header['mdate'] &0x001F;            $header['mtime'] = mktime($hour, $minute, $seconde, $month, $day, $year);        }Else{            $header['mtime'] = time();        }        $header['stored_filename'] = $header['filename'];        $header['status'] = 'ok';        IF(substr($header['filename'], -1) == '/')            $header['external'] = 0x41FF0010;        Return $header;    }    Function ReadCentralDir($zip, $zip_name){        $size = filesize($zip_name);        IF($size < 277){$maximum_size = $size;}Else{$maximum_size = 277;}        @fseek($zip, $size - $maximum_size);        $pos = ftell($zip);        $bytes = 0x00000000;        While($pos < $size){            $byte = @fread($zip, 1);            $bytes = ($bytes << 8) | Ord($byte);            IF($bytes == 0x504b0506){                $pos++;                break;            }            $pos++;        }        $data = unpack('vdisk/vdisk_start/vdisk_entries/ventries/Vsize/Voffset/vcomment_size', fread($zip, 18));        IF($data['comment_size'] != 0){$centd['comment'] = fread($zip, $data['comment_size']);}Else{$centd['comment'] = '';}        $centd['entries'] = $data['entries'];        $centd['disk_entries'] = $data['disk_entries'];        $centd['offset'] = $data['offset'];        $centd['disk_start'] = $data['disk_start'];        $centd['size'] = $data['size'];        $centd['disk'] = $data['disk'];        Return $centd;    }    Function ExtractFile($header, $to, $zip){        $header = $this -> readfileheader($zip);        IF(substr($to, -1) != "/") $to .= "/";        IF([email protected]_dir($to)) @mkdir($to, 0777);        $pth = explode("/", dirname($header['filename']));        For($i = 0;isset($pth[$i]);$i++){            IF(!$pth[$i]) continue;            $pthss .= $pth[$i] . "/";            IF(!is_dir($to . $pthss)) @mkdir($to . $pthss, 0777);        }        IF(!($header['external'] == 0x41FF0010) && !($header['external'] == 16)){            IF($header['compression'] == 0){                $fp = @fopen($to . $header['filename'], 'wb');                IF(!$fp) Return(-1);                $size = $header['compressed_size'];                While($size != 0){                    $read_size = ($size < 2048 ? $size : 2048);                    $buffer = fread($zip, $read_size);                    $binary_data = pack('a' . $read_size, $buffer);                    @fwrite($fp, $binary_data, $read_size);                    $size -= $read_size;                }                fclose($fp);                touch($to . $header['filename'], $header['mtime']);            }Else{                $fp = @fopen($to . $header['filename'] . '.gz', 'wb');                IF(!$fp) Return(-1);                $binary_data = pack('va1a1Va1a1', 0x8b1f, Chr($header['compression']),                    Chr(0x00), time(), Chr(0x00), Chr(3));                fwrite($fp, $binary_data, 10);                $size = $header['compressed_size'];                While($size != 0){                    $read_size = ($size < 1024 ? $size : 1024);                    $buffer = fread($zip, $read_size);                    $binary_data = pack('a' . $read_size, $buffer);                    @fwrite($fp, $binary_data, $read_size);                    $size -= $read_size;                }                $binary_data = pack('VV', $header['crc'], $header['size']);                fwrite($fp, $binary_data, 8);                fclose($fp);                $gzp = @gzopen($to . $header['filename'] . '.gz', 'rb') or die("Cette archive est compress閑");                IF(!$gzp) Return(-2);                $fp = @fopen($to . $header['filename'], 'wb');                IF(!$fp) Return(-1);                $size = $header['size'];                While($size != 0){                    $read_size = ($size < 2048 ? $size : 2048);                    $buffer = gzread($gzp, $read_size);                    $binary_data = pack('a' . $read_size, $buffer);                    @fwrite($fp, $binary_data, $read_size);                    $size -= $read_size;                }                fclose($fp);                gzclose($gzp);                touch($to . $header['filename'], $header['mtime']);                @unlink($to . $header['filename'] . '.gz');            }        }        Return true;    }}