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# ftell

(PHP 3, PHP 4 , PHP 5)

ftell -- Tells file pointer read/write position

## Description

int ftell ( resource handle)

Returns the position of the file pointer referenced by handle; i.e., its offset into the file stream.

If an error occurs, returns `FALSE`.

The file pointer must be valid, and must point to a file successfully opened by fopen() or popen().

示範 1.ftell() example
`<?php // opens a file and read some data $fp = fopen("/etc/passwd", "r"); $data = fgets($fp, 12); // where are we ? echo ftell($fp); // 11 fclose($fp); ?>`

See also fopen(), popen(), fseek(), and rewind().

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