Update Config File Class - Not Working

[abockover]

Hello,

I am very new to PHP and am trying to create a class that updates a flat file configuration file in the form of Key=Value

I can read the configuration file and split it up with no problem, however, I am having trouble updating the file.

The class I am working on cycles through the config file and if the given Key matches the current Key, it rewrites that line in the form of 'Key=NewValue'. If the given Key does not match the current key, it writes the line in the form of 'Key=OldValue'.

I am really stumped. I am not getting an returned errors, the class just does not work! I tried echoing out what is written to the variable so I could see what's going on, but nothing gets echoed. I can't figure it out! The code is as follows:

// THIS CODE WORKS
// Config File
$cfgitem = file("$root\include\config.dat");

// Read the file and create corresponding objects
foreach ($cfgitem as $key => $value) {
list ($name,$value) = split ('=', $value);
$config->$name = $value;
}
// END WORKING CODE

// THIS CODE DOES NOT WORK
class UpdateConfig {
var $file;
var $delimeter;
var $keyname;
var $keyval;

function Execute($file,$delimeter,$keyname,$keyval) {
    $this->file = $file;
    $this->delimeter = $delimeter;
    $this->keyname = $keyname;
    $this->keyval = $keyval;
    $cfgitem = file($this->file);
    foreach($cfgitem as $key => $value) {
        list ($name,$value) = split($this->delimeter, $value);
        if($name == $this->keyname) {
            //echo "$this->keyname$this->delimeter$this->keyval\n";
            $updatecfg .= "$this->keyname$this->delimeter$this->keyval\n";
        } else {
            //echo "$name$this->delimeter$value\n";
            $updatecfg .= "$name$this->delimeter$value\n";
        }
    }
    $newcfg = fopen($this->file, "w");
    fputs($newcfg,$updatedcfg);
    fclose($newcfg);
}

}
// END WORKING CODE

// Class Invocation
$updobj = new UpdateConfig;
$updobj->Execute($cfgitem,"=","Name","Aaron Bockover");

Thank you so much for your help!

-Aaron

[abockover]

It's me again - I left something out.

Here's an example:

If my config file ('cfg.txt') has the contents of

Name=Aaron
City=Raleigh

Theoretically, if the class worked like I want it to, running this code:

$updobj = new UpdateConfig;
$updobj->Execute("cfg.txt","=","Name","BOB");

The config file would be changed to

Name=BOB
City=Raleigh

Thank you for your help,

Aaron

[toma42]

Check out the WDDX functions. I think they work great for config files that don't need to be easily human readable (but they still can be) but which have valuse that need to be updated.

I use an array which I serialize into wddx for my config stuff on those projects where something like this is useful.

[abockover]

Hi,

I really just wanted to use my home grown solution. I was able to solve the problem, below is my ConfigUpdate() function.

function ConfigUpdate($file,$delimeter,$keyname,$keyval) {
$isupdated = 0;
$cfgitem = file($file);
foreach($cfgitem as $key => $value) {
list ($name,$value) = split($delimeter, $value);
if($name == $keyname) {
$updatecfg .= "$keyname$delimeter$keyval\n";
} else {
$value = substr($value,0,strlen($value)-2);
$updatecfg .= "$name$delimeter$value\n";
}
}
$newcfg = fopen($file, "w");
fputs($newcfg,$updatecfg);
fclose($newcfg);
}
// end function

ConfigUpdate("cfg.dat","=","Name","New Value");

The function searches through the file and looks for the key "Name" and replaces the value of "Name" with the new value, "New Value"

You can parse the config file to load the data with the following:

$cfgitem = file("cfg.dat");
foreach ($cfgitem as $key => $value) {
list ($name,$value) = split("=", $value);
$config->$name = $value;
}
// end parsing

echo "Name: $config->Name<br>";

[toma42]

My solution: One global array that contains configuration information. To add or edit it, you do it directly:

$config['company'] = 'whatever';
updateconfig();

function updateconfig()
{
global $config;
if (!$config) return;

$somepath='/home/web/cfg';
unlink($somepath . '/config.xml');
error_log(wddx_serialize_value($config, "Configuration"), 3, $somepath . '/config.xml');

}

I find it easy to use. Congrats on getting you own method working however.

[toma42]

Oh, I should point out this solution allows for arrays such as

$config['authusers'] = array ('ed', 'bo', 'jo');

and there is no fixed delimiter. I think yours will break with:

somekey=this=that

where this=that should be the value of somekey

[abockover]

This is true, however, since I can control what the value of a key is, I can make sure not to place $delimeter in the key, or search the new value for $delimeter and replace it with something else.

$delimeter could also be a string of weird characters that would not get accidently placed in the value.

I really like your wddx method too! I just had a personal goal to get my version working. I've only been working with PHP for a week, and I really wanted to get it to work.

Thanks!