Richard, Thanks for the answer. I understand that I can't do it the way I wanted . I have changed my design. Thanks ALL who answered. -Saswat On Apr 7, 2005 8:18 AM, Richard Lynch <ceo@xxxxxxxxx> wrote: > On Wed, April 6, 2005 10:07 am, Saswat Praharaj said: > > I need some help in searching string in a file. > > > > My requirement is to search the string,append something to the string . > > Write the string back to the file without changing other parts of the > > file. > > > > e.g > > Suppose I have the following string in a file > > > > > > Set-Cookie: T_COOKIE=127.0.0.1-saswat-9; path=/ > > > > > > The fixed string is "Set-Cookie: T_COOKIE="and rest of the string is > > variable. > > I would like to change the string "127.0.0.1-saswat-9" to say > > "127.0.0.1-saswat-9-1234" > > Problem is, that's *MORE* bytes than are already there. > > You can't just smush a few more bytes in. > > You will *HAVE* to write out a new file. > > But you can read in only the first couple hundred bytes until you find > your Set-Cookie: T_COOKIE, and then you write out the stuff before that, > write out your new data, then read/write the whole rest of the file. > > You may also want to consider using, say, awk or sed or whatever from > http://php.net/exec -- I don't expect them to be that much faster than > PHP, but what do I know? > > > My constraint is : I don't want to read the whole file into a buffer > > and work on that buffer as the file can be very large , sometimes more > > than 10 mb. > > > > My advantage is : I know that I will get the search string in first > > 200 bytes of the file , so I just need to read 200 bytes,play with > > that and write it back (overwriting the first 200 bytes with new 200 > > some bytes) .. > > If it's really 200 bytes for 200 bytes, yeah, fopen(..., 'r+') will work. > > But if you can't squeeze your bytes into the same space as is already > there, you can't do that. > > You might also be able, for the future, to start using: > 127.0.0.1-saswat-9-0000000 and then you'd be able to replace up to > 99999999 and get back something you can easily read/write/format to be > meaningful. > > -- > Like Music? > http://l-i-e.com/artists.htm > > -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
