# gzpassthru

(PHP 4, PHP 5, PHP 7)

gzpassthru — Output all remaining data on a gz-file pointer

### 说明

gzpassthru ( resource `$zp` ) : int

Reads to EOF on the given gz-file pointer from the current position and writes the (uncompressed) results to standard output.

> Note:

> You may need to call gzrewind() to reset the file pointer to the beginning of the file if you have already written data to it.

Tip

If you just want to dump the contents of a file to the output buffer, without first modifying it or seeking to a particular offset, you may want to use the readgzfile() function, which saves you the gzopen() call.

### 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 number of uncompressed characters read from `gz` and passed through to the input, or `FALSE` on error.

### 范例

Example #1 gzpassthru() example

    <?php
    $fp = gzopen('file.gz', 'r');
    gzpassthru($fp);
    gzclose($fp);
    ?>