Класс, который позволяет создать zip-архив из нескольких файлов. Взят из phpMyAdmin/ Недостаток: не устанавливается время создания файла в архиве.

                        
/** 

 * Zip file creation class. 

 * Makes zip files. 

 * 

 * Based on : 

 * 

 *  http://www.zend.com/codex.php?id=535&single=1 

 *  By Eric Mueller ([email protected]) 

 * 

 *  http://www.zend.com/codex.php?id=470&single=1 

 *  by Denis125 ([email protected]) 

 * 

 * Official ZIP file format: http://www.pkware.com/appnote.txt 

 * 

 * @access  public 

 */ 

class zipfile 

{ 

    /** 

     * Array to store compressed data 

     * 

     * @var  array    $datasec 

     */ 

    var $datasec      = array(); 

 

    /** 

     * Central directory 

     * 

     * @var  array    $ctrl_dir 

     */ 

    var $ctrl_dir     = array(); 

 

    /** 

     * End of central directory record 

     * 

     * @var  string   $eof_ctrl_dir 

     */ 

    var $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00"; 

 

    /** 

     * Last offset position 

     * 

     * @var  integer  $old_offset 

     */ 

    var $old_offset   = 0; 

 

 

    /** 

     * Adds "file" to archive 

     * 

     * @param  string  file contents 

     * @param  string  name of the file in the archive (may contains the path) 

     * 

     * @access public 

     */ 

    function addFile($data, $name) 

    { 

        $name = str_replace('\\', '/', $name); 

 

        $fr   = "\x50\x4b\x03\x04"; 

        $fr   .= "\x14\x00";            // ver needed to extract 

        $fr   .= "\x00\x00";            // gen purpose bit flag 

        $fr   .= "\x08\x00";            // compression method 

        $fr   .= "\x00\x00\x00\x00";    // last mod time and date 

 

        // "local file header" segment 

        $unc_len = strlen($data); 

        $crc     = crc32($data); 

        $zdata   = gzcompress($data,9); 

        $zdata   = substr(substr($zdata, 0, strlen($zdata) - 4), 2); // fix crc bug 

        $c_len   = strlen($zdata); 

        $fr      .= pack('V', $crc);             // crc32 

        $fr      .= pack('V', $c_len);           // compressed filesize 

        $fr      .= pack('V', $unc_len);         // uncompressed filesize 

        $fr      .= pack('v', strlen($name));    // length of filename 

        $fr      .= pack('v', 0);                // extra field length 

        $fr      .= $name; 

 

        // "file data" segment 

        $fr .= $zdata; 

 

        // "data descriptor" segment (optional but necessary if archive is not 

        // served as file) 

        $fr .= pack('V', $crc);                 // crc32 

        $fr .= pack('V', $c_len);               // compressed filesize 

        $fr .= pack('V', $unc_len);             // uncompressed filesize 

 

        // add this entry to array 

        $this -> datasec[] = $fr; 

        $new_offset        = strlen(implode('', $this->datasec)); 

 

        // now add to central directory record 

        $cdrec = "\x50\x4b\x01\x02"; 

        $cdrec .= "\x00\x00";                // version made by 

        $cdrec .= "\x14\x00";                // version needed to extract 

        $cdrec .= "\x00\x00";                // gen purpose bit flag 

        $cdrec .= "\x08\x00";                // compression method 

        $cdrec .= "\x00\x00\x00\x00";        // last mod time & date 

        $cdrec .= pack('V', $crc);           // crc32 

        $cdrec .= pack('V', $c_len);         // compressed filesize 

        $cdrec .= pack('V', $unc_len);       // uncompressed filesize 

        $cdrec .= pack('v', strlen($name));  // length of filename 

        $cdrec .= pack('v', 0 );             // extra field length 

        $cdrec .= pack('v', 0 );             // file comment length 

        $cdrec .= pack('v', 0 );             // disk number start 

        $cdrec .= pack('v', 0 );             // internal file attributes 

        $cdrec .= pack('V', 32 );            // external file attributes - 'archive' bit set 

 

        $cdrec .= pack('V', $this -> old_offset ); // relative offset of local header 

        $this -> old_offset = $new_offset; 

 

        $cdrec .= $name; 

 

        // optional extra field, file comment goes here 

        // save to central directory 

        $this -> ctrl_dir[] = $cdrec; 

    } // end of the 'addFile()' method 

 

 

    /** 

     * Dumps out file 

     * 

     * @return  string  the zipped file 

     * 

     * @access public 

     */ 

    function file() 

    { 

        $data    = implode('', $this -> datasec); 

        $ctrldir = implode('', $this -> ctrl_dir); 

 

        return 

            $data . 

            $ctrldir . 

            $this -> eof_ctrl_dir . 

            pack('v', sizeof($this -> ctrl_dir)) .  // total # of entries "on this disk" 

            pack('v', sizeof($this -> ctrl_dir)) .  // total # of entries overall 

            pack('V', strlen($ctrldir)) .           // size of central dir 

            pack('V', strlen($data)) .              // offset to start of central dir 

            "\x00\x00";                             // .zip file comment length 

    } // end of the 'file()' method 

 

} // end of the 'zipfile' class