SplFileObject::fseek

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

SplFileObject::fseekSeek to a position

Descrizione

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

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.

Elenco dei parametri

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.

Valori restituiti

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

Esempi

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);
?>

Vedere anche:

  • fseek() - Sposta un puntatore sul file

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User Contributed Notes 1 note

up
-7
wangbuying at gmail dot com
11 years ago
make sure you know this fseek in SplFileObject is different from \fseek.
Argument for fseek in SplFileObject is the line number, not the bytes.
Example:
<?php
$fp
= new SplFileObject('./fseek.txt', 'rb');
$fp->fseek(70); // now go to line 70, not byte 70
echo $fp->fgets();
?>
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