[Plugin: WP-Members] Customize submit button

The plugin does have some pluggable functions, of which the registration form is one. However, to do that, you do need to make sure you watch that your plugged function remains compatible with future versions, which to me seems like a lot of work to change one button.

The registration form (I assume that’s what we are talking about, since that is the only button that says “submit”) is in wpmem_inc_registration_NEW in wp-members-dialogs.php. (Note: the legacy forms (_OLD) are scheduled to be deprecated in an upcoming version, so this function may be reverted to wpmem_inc_registration)

Info on pluggable functions in WP-Members:
http://butlerblog.com/2011/11/29/customizing-wp-members-with-pluggable-functions/

With the release of the 2.7.4 version, you could use the filter for the form. If we are talking about the registration form, the filter is wpmem_register_form and the generated html of the form is passed through the filter. You could use php’s str_replace to filter the submit button to read ‘register’:

add_filter( 'wpmem_register_form', 'my_submit_button_filter' );
function my_submit_button_filter( $string ) {

	// the html of the form is the parameter $string

	// use str_replace like:
	// $new_string = str_replace( $needle, $replacement, $haystack );

	$string  = str_replace( 'Submit', 'Register', $string );

	return $string;

}

Thanks for the comments @win7mac – actually, the buttons can be translated. I believe all of them are gettext strings. If your buttons are not translating, it could be that you are working from an out-of-date .pot file. The most recent file included in the download does have them (see: http://plugins.svn.wordpress.org/wp-members/trunk/lang/wp-members.pot).

So if translation is your need, then that’s the simplest way.

As an aside, you mentioned that you can edit simple code in php. If that’s the case, I would recommend you learn the power of the filter hook in WordPress. Action and filter hooks are all accessed via php code. The WP-Members plugin provides many hooks for customization following the WP standard for hooks. If you learn how to use these, your ability to customize both WP-Members and WP itself is immense.