Example showing how to replace strings in the PMPro Sponsored Members Add On

my_pmprosm_string_replacement.php

/*
	Replace strings in the PMPro Sponsored Members Add On
	Add this code to a custom plugin.
	
	Note we check for 2 different but similar text domains. We SHOULD
	set our text domains to match the slug of the plugin, but in this
	case we used underscores instead of dashes and need to support both
	for backwards compatability.

	The original text must match exactly how it shows up in the code.
	Search the code on GitHub to see how the strings are built.
	https://github.com/strangerstudios/pmpro-sponsored-members
*/
function my_pmprosm_string_replacement($translated_text, $original_text, $domain) {	
	if(($domain == 'pmpro_sponsored_members' || $domain == 'pmpro-sponsored-members')
		&& $original_text == 'Would you like to purchase extra seats?') {
		$translated_text = 'How many students do you need to add?';
	}
	
	return $translated_text;
}
add_filter('gettext', 'my_pmprosm_string_replacement', 10, 3);