added snippets (#5)

README.md

@@ -27,9 +27,9 @@ Please include the following header format when submitting a snippet
 ```
 /**
  * Describe what the snippet does in one sentence. (i.e. Add a checkbox to the checkout page.)
- * 
+ *
  * Learn more at: https://lifterlms.com/link-to-content-if-available-or-remove-this-line/
- * 
+ *
  * 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.

lifterlms/admin-pages/llms-reporting-courses-students-custom-columns.php

@@ -0,0 +1,46 @@
+<?php
+/**
+ * Add custom columns and output data on the Courses > Students reporting for course export.
+ *
+ * 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/
+ */
+/**
+ * Output data for a custom column on the student reporting for course export.
+ *
+ * @param string $value   Default value being output
+ * @param string $key     Name of the custom field being output
+ * @param obj    $student LLMS_Student for the row
+ * @param string $context Output context "display" or "export"
+ * @return mixed
+ */
+function course_students_table_column_data( $value, $key, $data, $context ) {
+
+	if ( 'test' === $key ) {
+		$value = 'Some Test';
+	}
+
+	return $value;
+
+}
+add_filter( 'llms_table_get_data_course-students', 'course_students_table_column_data', 10, 4 );
+
+/**
+ * Add custom columns to the course students reporting table.
+ *
+ * @param array $cols Columns.
+ * @return array $cols Columns.
+ */
+function course_students_table_columns( $cols ) {
+
+	$cols['test'] = array(
+		'title'       => __( 'Test Test', 'lifterlms' ),
+		'export_only' => false, // set to false to show display screens but include in exports
+		'exportable'  => true, // set to false to exclude from exports
+	);
+
+	return $cols;
+}
+add_filter( 'llms_table_get_course-students_columns', 'course_students_table_columns', 10 );

lifterlms/courses-lessons/llms-get-course-ids-order-by-enrollments.php

@@ -0,0 +1,32 @@
+<?php
+/**
+ * Get all the course IDs ordered by enrolled students in descending order.
+ *
+ * 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/
+ */
+function llms_get_courses_ids_order_by_enrollments() {
+	// Get all the course IDs.
+	$course_ids = get_posts(
+		array(
+			'post_type'      => 'course',
+			'posts_per_page' => -1,
+			'fields'         => 'ids',
+		)
+	);
+
+	// Get the enrolled students count for each course.
+	$enrollment_counts = array();
+	foreach ( $course_ids as $course_id ) {
+		$course                          = new LLMS_Course( $course_id );
+		$enrollment_counts[ $course_id ] = $course->get_student_count();
+	}
+
+	// Sort the array in descending order.
+	arsort( $enrollment_counts );
+
+	return $enrollment_counts;
+}
+$desc_sorted_course_ids = llms_get_courses_ids_order_by_enrollments();

lifterlms/frontend-pages/llms-hiding-paid-access-plans-for-memberships-enrollments.php

@@ -0,0 +1,34 @@
+<?php
+/**
+ * Hiding paid access plans for students enrolled in particular memberships.
+ *
+ * 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/
+ */
+function llms_product_is_purchasable( $purchasable, $product ) {
+
+	$user_id           = get_current_user_id();
+	$free_access_plans = $product->get_access_plans( true );
+
+	// Get membership restrictions.
+	$membership_restrictions = array();
+	foreach ( $free_access_plans as $plan ) {
+		$membership_restrictions[] = $plan->get( 'availability_restrictions' );
+	}
+
+	// Merging the array.
+	$membership_restrictions = array_merge( ...$membership_restrictions );
+
+	// Check if a user is enrolled in the memberships.
+	foreach ( $membership_restrictions as $membership_id ) {
+		if ( llms_is_user_enrolled( $user_id, $membership_id ) ) {
+			$purchasable = false;
+		}
+	}
+
+	return $purchasable;
+}
+
+add_filter( 'llms_product_is_purchasable', 'llms_product_is_purchasable', 10, 2 );