本文实例讲述了PHP文件压缩之PHPZip类用法。分享给大家供大家参考。具体如下:
$dtime = dechex($this->unix2DosTime($time));
$hexdtime = 'x' . $dtime[6] . $dtime[7]
. 'x' . $dtime[4] . $dtime[5]
. 'x' . $dtime[2] . $dtime[3]
. 'x' . $dtime[0] . $dtime[1];
eval('$hexdtime = "' . $hexdtime . '";');
$fr = "x50x4bx03x04";
$fr .= "x14x00"; // ver needed to extract
$fr .= "x00x00"; // gen purpose bit flag
$fr .= "x08x00"; // compression method
$fr .= $hexdtime; // last mod time and date
// "local file header" segment
$unc_len = strlen($data);
$crc = crc32($data);
$zdata = gzcompress($data);
$c_len = strlen($zdata);
$zdata = substr(substr($zdata,strlen($zdata) - 4),2); // fix crc bug
$fr .= pack('V',$crc); // crc32
$fr .= pack('V',$c_len); // com<a href="https://www.jb51.cc/tag/pressed/" target="_blank" class="keywords">pressed</a> filesize
$fr .= pack('V',$unc_len); // uncom<a href="https://www.jb51.cc/tag/pressed/" target="_blank" class="keywords">pressed</a> 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); // com<a href="https://www.jb51.cc/tag/pressed/" target="_blank" class="keywords">pressed</a> filesize
$fr .= pack('V',$unc_len); // uncom<a href="https://www.jb51.cc/tag/pressed/" target="_blank" class="keywords">pressed</a> filesize
// add this entry to array
$this -> datasec[] = $fr;
$new_offset = strlen(implode('',$this->datasec));
// <a href="https://www.jb51.cc/tag/Now/" target="_blank" class="keywords">Now</a> add to central directory record
$cdrec = "x50x4bx01x02";
$cdrec .= "x00x00"; // version made by
$cdrec .= "x14x00"; // version needed to extract
$cdrec .= "x00x00"; // gen purpose bit flag
$cdrec .= "x08x00"; // compression method
$cdrec .= $hexdtime; // last mod time & date
$cdrec .= pack('V',$crc); // crc32
$cdrec .= pack('V',$c_len); // com<a href="https://www.jb51.cc/tag/pressed/" target="_blank" class="keywords">pressed</a> filesize
$cdrec .= pack('V',$unc_len); // uncom<a href="https://www.jb51.cc/tag/pressed/" target="_blank" class="keywords">pressed</a> 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 ); // <a href="https://www.jb51.cc/tag/dis/" target="_blank" class="keywords">dis</a>k 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
"x00x00"; // .zip file comment length
} // end of the 'file()' method
} // end of the 'PHPZip' class
?>
使用方法:
希望本文所述对大家的PHP程序设计有所帮助。
原文地址:https://www.jb51.cc/php/21747.html
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