Filesystem Funcții
PHP Manual

fseek

(PHP 4, PHP 5)

fseekSeeks on a file pointer

Descrierea

int fseek ( resource $handle , int $offset [, int $whence = SEEK_SET ] )

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.

Parametri

handle

O resursă de tip indicator în sistemul de fișiere care este în mod tipic creată utilizând fopen().

offset

The offset.

To move to a position before the end-of-file, you need to pass a negative value in offset and set whence to SEEK_END.

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.

Valorile întoarse

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

Exemple

Example #1 fseek() example

<?php

$fp 
fopen('somefile.txt''r');

// read some data
$data fgets($fp4096);

// move back to the beginning of the file
// same as rewind($fp);
fseek($fp0);

?>

Note

Notă:

If you have opened the file in append (a or a+) mode, any data you write to the file will always be appended, regardless of the file position, and the result of calling fseek() will be undefined.

Notă:

May not be used on file pointers returned by fopen() if they use the http:// or ftp:// schemes.

Vedeți de asemenea


Filesystem Funcții
PHP Manual