Zlib 函数
在线手册：中文 英文
PHP手册

gztell

(PHP 4, PHP 5)

gztell — Tell gz-file pointer read/write position

说明

int gztell ( resource $zp )

Gets the position of the given file pointer; i.e., its offset into the uncompressed file stream.

参数

zp

The gz-file pointer. It must be valid, and must point to a file successfully opened by gzopen().

返回值

The position of the file pointer or FALSE if an error occurs.

参见

Zlib 函数
在线手册：中文 英文
PHP手册
PHP手册 - N: Tell gz-file pointer read/write position

用户评论:

Steve Ramage (18-Dec-2006 06:09)

ok so this function returns the gz file pointer as the uncompressed data byte length so if you are trying to put something in to specific size gzip files it won't work.

Example:

<?
//some_file.sql  filesize = 2,048,000 bytes

$text_fp=fopen('some_file.sql','r');
$gz_fp=gzopen('some_file.sql.gz','wb9');
while(!feof($text_fp)){
    gzwrite($gz_fp,fread($text_fp,655360));
}
fclose($text_fp);
echo "gztell = ".gztell($gz_fp)."<BR>\n";
gzclose($gz_fp);
echo "filesize = ".filesize('some_file.sql.gz')."<BR>\n";
?>

Output:

gztell = 2048000
filesize = 249264

I will report this as a bug but post a note here for now