( resource handle )
Reads to EOF on the given file pointer from the current position and
writes the results to the output buffer.
If an error occurs, fpassthru() returns
FALSE. Otherwise, fpassthru() returns
the number of characters read from handle
and passed through to the output.
The file pointer must be valid, and must point to
a file successfully opened by fopen() or
fsockopen() (and not yet closed by
You may need to call rewind() to reset the file
pointer to the beginning of the file if you have already written data
to the file.
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 readfile(), which saves you
the fopen() call.
When using fpassthru() on a binary file on Windows
systems, you should make sure to open the file in binary mode by
appending a b to the mode used in the call to
You are encouraged to use the b flag when dealing
with binary files, even if your system does not require it, so that
your scripts will be more portable.
Example 1. Using fpassthru() with binary files
// open the file in a binary mode
$name = './img/ok.png';
$fp = fopen($name, 'rb');
// send the right headers
header("Content-Length: " . filesize($name));
// dump the picture and stop the script
See also readfile(),
fopen(), popen(), and