Adding course title merge code for certificates.

Author: brianhogg

lifterlms/llms-certificate-course-title-merge-code.php

@@ -0,0 +1,36 @@
+<?php // Don't copy this line!
+/**
+ * Add a {course_title} merge code to LifterLMS certificates.
+ *
+ * You can add this recipe to your site by creating a custom plugin
+ * or using the Code Snippets plugin available for free in the WordPress repository.
+ * Read this companion documentation for step-by-step directions on either method.
+ * https://lifterlms.com/docs/adding-custom-code/
+ */
+
+add_filter( 'llms_certificate_merge_codes', 'llms_custom_course_title_merge_code', 10, 2 );
+
+function llms_custom_course_title_merge_code( $merge_codes_array, $certificate_object ){
+
+	// the triger post's (course's) id is in the lesson_id property of the $certificate_object
+	$course_title = get_the_title( $certificate_object->lesson_id );
+
+	// add custom certificate title merge code to existing ones
+	$merge_codes_array['{course_title}'] = $course_title;
+	
+	// return new merge code list
+	return $merge_codes_array;
+}
+
+add_filter( 'llms_merge_codes_for_button', 'llms_custom_course_title_merge_code_for_button', 10, 2 );
+
+function llms_custom_course_title_merge_code_for_button( $codes, $screen ){
+	// don't run on emails
+	if( $screen->post_type != 'llms_certificate' ){
+		return;
+	}
+	
+	$codes['{course_title}'] = "Course Title";
+	
+	return $codes;
+}