ftell

(PHP 4, PHP 5, PHP 7)

ftell — Returns the current position of the file read/write pointer

설명

int ftell ( resource $handle )

Returns the position of the file pointer referenced by handle.

인수

handle: The file pointer must be valid, and must point to a file successfully opened by fopen() or popen(). ftell() gives undefined results for append-only streams (opened with "a" flag).

반환값

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

If an error occurs, returns FALSE.

Note: PHP의 정수형은 부호 있는 형식이고 많은 플랫폼이 32비트 정수를 사용하기에, 몇몇 파일시스템 함수는 2GB가 넘는 파일에 대해서 예측할 수 없는 결과를 반환합니다.

예제

Example #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);

?>

참고

fopen() - Opens file or URL
popen() - Opens process file pointer
fseek() - Seeks on a file pointer
rewind() - Rewind the position of a file pointer