SplFileObject
PHP Manual

SplFileObject::fseek

Seek to a position

Description

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.

Parameters

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.

Return Values

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

Examples

Example #1 SplFileObject::fseek example

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

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

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

See Also

  • fseek