PHP GZ压缩与解压

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/*将字符串添加至GZ文件*/ function gz_str($str,$gz_name){     $fp = gzopen ($gz_name, 'w9');     gzwrite ($fp, $str);     gzclose($fp);    } /*将文件添加至GZ文件*/ function gz_file($file,$gz_name){     $fp = gzopen ($gz_name, 'w9');     gzwrite ($fp, file_get_contents($file));     gzclose($fp);    } /*读取GZ文件*/ function read_gz($gz_file){     $buffer_size = 4096; // read 4kb at a time     $file = gzopen($gz_file, 'rb');     $str='';     while(!gzeof($file)) {         $str.=gzread($file, $buffer_size);     }     gzclose($file);     return $str; } /*解压GZ文件*/ function unzip_gz($gz_file){     $buffer_size = 4096; // read 4kb at a time     $out_file_name = str_replace('.gz', '', $gz_file);     $file = gzopen($gz_file, 'rb');     $out_file = fopen($out_file_name, 'wb');     $str='';     while(!gzeof($file)) {         fwrite($out_file, gzread($file, $buffer_size));     }     fclose($out_file);     gzclose($file); }