PHP not executing the same function a second time - php

Question

I have a function that I call using Config::save('key', $value);
public static function save($params, $value)
{
$parts = explode('.', $params);
$count = count($parts);
$mainFile = PANEL_PATH.'/conf.php';
$mainConfig = include $mainFile;
if($count == 1)
{
if(isset($mainConfig[$parts[0]]))
{
$mainConfig[$parts[0]] = $value;
}
}
elseif($count == 2)
{
if(isset($mainConfig[$parts[0]][$parts[1]]))
{
$mainConfig[$parts[0]][$parts[1]] = $value;
}
}
elseif($count == 3)
{
if(isset($mainConfig[$parts[0]][$parts[1]][$parts[2]]))
{
$mainConfig[$parts[0]][$parts[1]][$parts[2]] = $value;
}
}
elseif($count == 4)
{
if(isset($mainConfig[$parts[0]][$parts[1]][$parts[2]][$parts[3]]))
{
$mainConfig[$parts[0]][$parts[1]][$parts[2]][$parts[3]] = $value;
}
}
ob_start();
echo var_export($mainConfig);
$content = ob_get_contents();
ob_end_clean();
$content = str_replace(" ", "\t", $content);
$content = str_replace("\n\tarray (", "array(", $content);
$content = str_replace("\n\t\tarray (", "array(", $content);
$content = str_replace("\n\t\t\tarray (", "array(", $content);
$mainFileHandler = fopen($mainFile, 'w+');
$mainFileWrite = fwrite($mainFileHandler, "<?php\n\nreturn " . $content . ";");
if($mainFileWrite > 0)
{
return true;
}
else
{
return false;
}
fclose($mainFileHandler);
}
And the conf.php file looks like this:
<?php
return array (
'name' => '<NAME>',
'license' => '<LICENSE>',
'url' => '<URL>',
'usage_id' => '<USAGE_ID>',
'installed' => '<INSTALLED>'
);
So when I do this statement
if (Config::save('usage_id', 'USAGE_ID') && Config::save('license', 'LICENSE'))
{
echo "Reset License";
}
It only resets the license variable, it seems like it skips over the first one. Is there something wrong with the code that's making it act like this?
If anymore code is needed let me know and I'll be glad to provide it.