configuration class - skeleton code for first OOP adventure

Hi, My first larger project is growing out of control. I've spent some weeks reading OOP tutorials, and feel ready to make my first dive into a new programming style. One of the things that led me this way was the need for user configuration of my project. Therefor, I'll start with a class that let's me read and write a configuration file. Is this a good start, or should I change anything? class configuration { var $configurationFile; function configuration($configurationFile) {

    $this->setConfigurationFile($configurationFile);

} function setConfigurationFile($configurationFile) {

    // Code to check that $configurationFile points to a valid file

} function readConfigurationFile() {

    $configurationArray = parse_ini_file($this->configurationFile, TRUE);
    return $configurationArray;

} function writeConfigurationFile($changedValues) {

    $fp = fopen($this->configurationFile, "r" );
    $contents = fread($fp, filesize($this->configurationFile));
    fclose($fp);

    foreach ($changedValues as $changedValue)
    {
      $new_contents = ereg_replace($changedValue[old], $changedValue[new], $contents);
      $contents = $new_contents;
    }

    $fp = fopen($this->configurationFile, "w" );
    fwrite($fp, $contents);
    fclose($fp);

} } Best regards, -- anders thoresson