adding to file?

[scbmx]

im an intermediate php newbie and ive alreayd figured out how to use fopen and fwrite and stuff to insert vars and other stupp into files. but i cant make it so it just adds new content instead of deleting everything in the file and just putting what i tell it to. I want to have it like a guestbook or news publishing type-of-thing. i use

 $fo = fopen("config.php", "w");
	 #php tags
      $sphp = "<?php\n";
      $ephp = "?>\n";


 if($reset == NULL){
#dbaccess 
     $hostD = "\$host = '$host';\n";
     $userD = "\$user = '$user';\n";
     $passD = "\$pass = '$pass';\n";
     $dbD = "\$db = '$db';\n";
     $tableD = "\$table = '$table';\n";
     $guserD = "\$guser = '$guser';\n";
     $gpassD = "\$gpass = '$gpass';\n";
}
    #writing
     fwrite($fo, $sphp);
	 fwrite($fo, $hostD);
     fwrite($fo, $userD);
     fwrite($fo, $passD);
     fwrite($fo, $dbD);
     fwrite($fo, $tableD);
     fwrite($fo, $guserD);
     fwrite($fo, $gpassD);
     fwrite($fo, $ephp);

#close file
 fclose($fo);

thats just an example but thtas the kind that erases enerything and just puts what i have assigned. i want to make it so i can keep adding on more stuff

please give me an example

[swjohnson]

w+ or a+

According to my limited resources the fopen() command accepts

r for Read Only pointer at the beginning of the file

r+ Reading & writing pointer at the beginning of the file

w Write only pointer at the beginning of the file. The file is truncated to zero length and if it doesn't exist it will try to open a new one.

w+ Reading & writing pointer at the beginning of the file, file truncated to zero length and iwll attempt to create if not in existance.

a Write only file pointer a the end of the file. Will append to end of the file and will attempt to create it.

a+ Read & write, pointer at the end of the file will append and attempt to create if it doesn't exist.

[swjohnson]

<? php

// Creating the file

$newfile=(fopen(/usr/local/apache/htdocs/mydata.txt","a+");
fwrite($newfile,"this is a new file,");
fclose($newfile);

//Reading the file

// contains the full path to the file
$file_loc="/usr/local/apache/htdocs/mydata.txt";

// open the file for read only
$whattoread=fopen($file_loc,"r");

// Puts contents of entire file into a variable
$file_contents=fread($whattoread, filesize($file_loc));

// close the file
fclose($whattoread);

echo "the file contains: $file_contents";

// Writing back to the datafile

$rewrite=(fopen(/usr/local/apache/htdocs/mydata.txt","a+");
fwrite($rewrite,"this is a new file,");
fclose($rewrite);

Notice the Create and the Writing code is the same except for the file name.

[scbmx]

thanks the example you gave me worked well....it was more in depth than i thought it would be but it works so thanks

[swjohnson]

I took those examples directly out of Essential PHP by Julie Meloni. It is a good basic primer.

Glad I could help.