Ein kleiner INI-File Writer/Reader in PHP

/**
 * Write data to an INI file
 * 
 * The data array has to be like this:
 * 
 *  Array
 *  (
 *      [Section1] => Array
 *          (
 *              [key1] => val1
 *              [key2] => val2
 *          )
 *      [Section2] => Array
 *          (
 *              [key3] => val3
 *              [key4] => val4
 *          )    
 *  )
 *
 * @param string $filePath
 * @param array $data
 */
function ini_write($filePath, array $data)
{
    $output = '';

    foreach ($data as $section => $values)
    {
        //values must be an array
        if (!is_array($values)) {
            continue;
        }

        //add section
        $output .= "[$section]rn";

        //add key/value pairs
        foreach ($values as $key => $val) {
            $output .= "$key=$valrn";
        }
        $output .= "rn";
    }

    //write data to file
    file_put_contents($filePath, trim($output));
}


/**
 * Read and parse data from an INI file
 * 
 * The data is returned as follows:
 * 
 *  Array
 *  (
 *      [Section1] => Array
 *          (
 *              [key1] => val1
 *              [key2] => val2
 *          )
 *      [Section2] => Array
 *          (
 *              [key3] => val3
 *              [key4] => val4
 *          )    
 *  )
 * 
 * @param string $filePath
 * @return array|false
 */
function ini_read($filePath)
{
    if (!file_exists($filePath)) {
        return false;
    }

    //read INI file linewise
    $lines = array_map('trim', file($filePath));
    $data  = array();

    $currentSection = null;
    foreach ($lines as $line)
    {
        if (substr($line, 0, 1) == '[') {
            $currentSection = substr($line, 1, -1);
            $data[$currentSection] = array();
        }
        else
        {
            //skip line feeds in INI file
            if (empty($line)) {
                continue;
            }

            //if no $currentsection is still null,
            //there was missing a "[<sectionName>]"
            //before the first key/value pair
            if (null === $currentSection) {
                return false;
            }

            //get key and value
            list($key, $val) = explode('=', $line);
            $data[$currentSection][$key] = $val;
        }
    }

    return $data;
}