Put it all in a database, and write out the file whenever it changes? Only half-joking. Virtually all your problems mentioned go away if it's in a database, and it's not that tricky to set things up so you can write out the file from the db when you need to. On Sat, March 18, 2006 4:01 am, smr78 wrote: > Hi, > What is the best method to update a single line in a text file? > I have a file made of identifiers, that is pointed on by a htaccess > file and > used by a server to give access to a web site. > The file content is like this : > login1:pass1\r\n > login2:pass2\r\n > .... > loginn:passn\r\n > loginn1:passn1\r\n > .... > lastlogin:lastpass\r\n > > This file can be modified in three ways > update a single line when a user updates its profile > delete a single line when the webmaster makes a user inactive > append a line when the webmaster makes a user active > > the difficulties are : > there is not the same number of users and lines in this file, > we dont know at which line are the identifiers of a user, > when updating identifiers, we must keep new line characters at the > end. > > So what are the best functions to use to read and rewrite the file? > > file() which puts all the content in an array, including the new line > characters? (if so, we need to use array_search() or array_keys() to > find > where are the identifiers > > fread() or file_get_contents() which puts all the content in a string? > I > tried this way and use eregi_replace() to find where are the > identifiers, > replace them by new value. But sometimes, I get errors where the new > line > characters are suppressed between two users identifiers or where an > identifier is repeated like this : > > loginx:passx\r\n > loginx:passx\r\n > loginn:passnloginn1:passn1\r\n > loginn2:passn2\r\n > > Here is my code : > <? php > //reading the actual file content > $length=filesize($filename); > $fp=fopen($filename,"r"); > $str=fread($fp,$length); > fclose($fp); > > //in case of updating > $str=eregi_replace($oldlogin.":".$oldpass,$newlogin.":".$newpass,$str); > //in case of deleting > $str=eregi_replace($oldlogin.":".$oldpass,"",$str); > > //rewriting the file > $handle = fopen($filename,"w+") > fwrite($handle,$str,strlen($str)) > > //in case of inserting a new user > > $str=$newlogin.":".$newpass."\r\n"; > $handle = fopen($filename,"a") > fwrite($handle,$str,strlen($str)) > ?> > I know in "deleting" case, the eregi_replace pattern is so that the > new line > characters will not be removed, but this is not a problem > > I'll try to use file() function and array_keys() and let you know. > Thanks > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, visit: http://www.php.net/unsub.php > > -- 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
