Creating a CSV with PHP inside the plugin directory

If you plan to write to a pugin folder since you used fopen, fwite, flose you are using the wrong function:

File: wp-includes/link-template.php
3189: /**
3190:  * Retrieves a URL within the plugins or mu-plugins directory.
3191:  *
3192:  * Defaults to the plugins directory URL if no arguments are supplied.
3193:  *
3194:  * @since 2.6.0
3195:  *
3196:  * @param  string $path   Optional. Extra path appended to the end of the URL, including
3197:  *                        the relative directory if $plugin is supplied. Default empty.
3198:  * @param  string $plugin Optional. A full path to a file inside a plugin or mu-plugin.
3199:  *                        The URL will be relative to its directory. Default empty.
3200:  *                        Typically this is done by passing `__FILE__` as the argument.
3201:  * @return string Plugins URL link with optional paths appended.
3202:  */
3203: function plugins_url( $path="", $plugin = '' ) {
3204:

You should probable use this function:

File: wp-includes/plugin.php
703: /**
704:  * Get the filesystem directory path (with trailing slash) for the plugin __FILE__ passed in.
705:  *
706:  * @since 2.8.0
707:  *
708:  * @param string $file The filename of the plugin (__FILE__).
709:  * @return string the filesystem path of the directory that contains the plugin.
710:  */
711: function plugin_dir_path( $file ) {
712:    return trailingslashit( dirname( $file ) );
713: }

Then you are on your own:

$plugin_dir = plugin_dir_path( __FILE__ );
$logfile = $plugin_dir . 'log.csv';

$fp = fopen($logfile, 'w');
fwrite($fp, $data);
fclose($fp);

At the moment plugins in WordPress have all the rights WordPress have when writing to a file system, and these are the rights given from the web server process.

Your naming convention is not perfect: $databaseURL is probably bad chosen. This is not a URL.

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