String Replacement Within a File

[SOL-ion]

Hi all,

I have some code which is meant to search through a configuration file for a certain string "$ASSET_DB_NAME = "";" If it finds it then it replaces it with $ASSET_DB_NAME = to a string. When I run the script below it appends at the end of the file "database_config.inc.tmp.php" the first line of it, which is "<?php".

<?php
require_once ("config-files/path_info.inc.php");

function update_config_file ($asset_db_name) {
	global $CONFIG_PATH;

$config_file = fopen ($CONFIG_PATH.'database_config.inc.tmp.php', 'a+') or die ($php_errormsg);
$search_file = fread ($config_file, filesize ($CONFIG_PATH.'database_config.inc.tmp.php')) or die ($php_errormsg);

$search_file = preg_replace ('/\$ASSET_DB_NAME = \"\";/', '$ASSET_DB_NAME = \"'.$asset_db_name.'\";', $search_file);

// seek back to the beginning of the file and write the string
rewind ($config_file);
if ( -1 == fwrite ($config_file, $search_file) ) { die ($php_errormsg); }
// adjust the file's length to just whats been written
ftruncate ($config_file, ftell ($config_file)) or die ($php_errormsg);

fclose ($config_file) or die ($php_errormsg);	
}  // update_config_file ($asset_db_name)

update_config_file ("test");
?>

I got most of this function from a book so I admit I do not understand it fully. Does anyone know what is going wrong?

Cheers

SOL

[rinjani]

fopen has the "a+" option, you are appending to the end of the file.

I think that's it anyway, you need to change it to "w+" as in:

$config file = fopen ($CONFIG_PATH.'database config.inc.tmp.php', 'w+') or die ($php_errormsg);

HTH

rinjani

edit: my browser added a bunch of _ ???

[SOL-ion]

I have just changed it to be "w+". It now just wipes the whole file "database_config.inc.tmp.php". Any ideas?

Cheers

SOL

[rinjani]

Try x or x+ then, I forgot that w+ will truncate the file. For more on fopen look in the manual:

http://us3.php.net/manual/en/function.fopen.php

You may have to play with a few of the options available.

HTH

rinjani