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(PHP 3, PHP 4, PHP 5)

fseek -- Seeks on a file pointer

Description

int fseek ( resource handle, int offset [, int whence] )

Sets the file position indicator for the file referenced by handle . The new position, measured in bytes from the beginning of the file, is obtained by adding offset to the position specified by whence , whose values are defined as follows:

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 . (To move to a position before the end-of-file, you need to pass a negative value in offset .)

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

Upon success, returns 0; otherwise, returns -1. Note that seeking past EOF is not considered an error.

Example 1. fseek() example

<?php

$fp = fopen('somefile.txt');

// read some data
$data = fgets($fp, 4096);

// move back to the beginning of the file
// same as rewind($fp);
fseek($fp, 0);

?>

May not be used on file pointers returned by fopen() if they use the "http://" or "ftp://" formats. fseek() gives also undefined results for append-only streams (opened with "a" flag).

Related Function(s)

fopen()

ftell()

rewind()