file open

raynestorm

Hi--
Can anyone show me a snippet of code that would:
1. open a txt file (a list of links)
2. append a new link to the top of the file (the link would be typed in from the browser)
3. close the txt file

The text file is an include file that an html file calls to display a list of links. I need to update the include file from a browser.

Any help would be greatly appreciated.
Thanks.
--Rayne

Weedpacket

'cos it's a text file you'll need to do it something like this: Read the whole file. Write the new line. Write the rest of the file out after it.

http://www.phpbuilder.com/board/showthread.php?s=&threadid=10231754&highlight=line+AND+text+AND+file
http://www.phpbuilder.com/board/showthread.php?s=&threadid=10222527&highlight=line+AND+text+AND+file

raynestorm

Thanks for the reply. Is there a way to get the "new information" input from an html form?

$fp = fopen("file.txt","r+b");
$contents = fread("file.txt",filesize("file.txt"));
fwrite("new information.\n".$contents);
fclose($fp);

--Rayne

Weedpacket

http://www.php.net/manual/en/language.variables.external.php

raynestorm

OK, thanks for the link. Getting closer...

<form action=<? echo $_SERVER['PHP_SELF']; ?> method=post>
<input name=url type=text>
<input type=submit value=submit>
</form>

$fp = fopen("file.txt","r+b");
$contents = fread("file.txt",filesize("file.txt"));
fwrite("url.\n".$contents);
fclose($fp);

Gives me:
Warning: fread(): supplied argument is not a valid File-Handle resource in /home/.sites/106/site3/web/add_url.php on line 19

Warning: Wrong parameter count for fwrite() in /home/.sites/106/site3/web/add_url.php on line 20

So, I changed line 19 to be:
$contents = fread($fp,filesize("include.php"));

but how do I fix the fwrite statement?

Thanks so much for the help.
--Rayne

raynestorm

So, this code:

$fp = fopen("file.txt","r+b");
$contents = fread($fp,filesize("file.txt"));
fwrite($fp,"url.\n".$contents);
fclose($fp);

adds the url to the top of the code, but writes the file back at the end of the original file, so the information is repeated twice. How do I get the new information to overwrite the old information in the file?
--Rayne

Weedpacket

After fread()ing the file, rewind() the file pointer back to the start of the file, and ftrunctate() its length to zero before fwrite()ing the new contents.

Seeing as this file looks like it will only grow and never shrink, I guess you could probably skip the ftruncate() step. Try it with and without.