update : 2015.11.03
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Seek to a position
SplFileObject
PHP Manual

SplFileObject::fseek

(PHP 5 >= 5.1.0)

SplFileObject::fseek — Seek to a position

설명

public int SplFileObject::fseek ( int $offset [, int $whence = SEEK_SET ] )

Seek to a position in the file measured in bytes from the beginning of the file, obtained by adding offset to the position specified by whence.

인수

offset

The offset. A negative value can be used to move backwards through the file which is useful when SEEK_END is used as the whence value.

whence

whence values are:

  • SEEK_SET - Set position equal to offset bytes.
  • SEEK_CUR - Set position to current location plus offset.
  • SEEK_END - Set position to end-of-file plus offset.

If whence is not specified, it is assumed to be SEEK_SET.

반환값

Returns 0 if the seek was successful, -1 otherwise. Note that seeking past EOF is not considered an error.

예제

Example #1 SplFileObject::fseek() example

<?php
$file = new SplFileInfo("somefile.txt");

// Read first line
$data = $file->fgets();

// Move back to the beginning of the file
// Same as $file->rewind();
$file->fseek(0);
?>

참고

  • fseek() - Seeks on a file pointer

SplFileObject
PHP Manual