rewind

(PHP 4, PHP 5)

rewind — Rewind the position of a file pointer

Opis

bool rewind ( resource $handle )

Sets the file position indicator for handle to the beginning of the file stream.

Informacja:
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.

Parametry

handle: The file pointer must be valid, and must point to a file successfully opened by fopen().

Zwracane wartości

Zwraca TRUE w przypadku powodzenia, FALSE w przypadku błędu.

Przykłady

Przykład #1 rewind() overwriting example


<?php
$handle = fopen('output.txt', 'r+');

fwrite($handle, 'Really long sentence.');
rewind($handle);
fwrite($handle, 'Foo');
rewind($handle);

echo fread($handle, filesize('output.txt'));

fclose($handle);
?>

Powyższy przykład wyświetli coś podobnego do:

Foolly long sentence.

Zobacz też:

fread() - Odczyt pliku binarnie bezpieczy
fseek() - Seeks on a file pointer
ftell() - Mówi o pozycji odczyt/zapis wskaźnika pliku
fwrite() - Zapis pliku binarnie bezpieczny

add a note User Contributed Notes rewind - [2 notes]

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MagicalTux at kinoko dot fr ¶

5 years ago


Note that rewind($fd) is exactly the same as fseek($fd, 0, SEEK_SET)



rewind() just moves the location inside the file to the beginning, nothing more. Check if your stream is "seekable" before planning to use fseek/rewind.

down

-1

evan at ozhiker dot no_spam dot com ¶

8 years ago


As with fseek(), the rewind() function may not be used on file pointers returned by fopen() if they use the "http://" or "ftp://" formats.

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