- page_select field for the Settings > General > Pages;

includes/um-core-functions.php

@@ -0,0 +1,84 @@
+<?php
+/**
+ * Ultimate Member Core Functions
+ *
+ * General core functions available on both the front-end and admin.
+ *
+ * @version 2.8.3
+ */
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
+/**
+ * @param string $slug
+ *
+ * @return bool
+ */
+function um_predefined_page_slug_exists( $slug ) {
+	$predefined_pages = UM()->config()->get( 'predefined_pages' );
+	return array_key_exists( $slug, $predefined_pages );
+}
+
+/**
+ * @param string $slug
+ *
+ * @return false|int
+ */
+function um_get_predefined_page_id( $slug ) {
+	if ( ! um_predefined_page_slug_exists( $slug ) ) {
+		return false;
+	}
+
+	$option_key = UM()->options()->get_predefined_page_option_key( $slug );
+	return apply_filters( 'um_get_predefined_page_id', UM()->options()->get( $option_key ), $slug );
+}
+
+/**
+ *
+ * @param string $slug
+ * @param null|int|\WP_Post $post
+ *
+ * @return bool
+ */
+function um_is_predefined_page( $slug, $post = null ) {
+	// handle $post inside, just we need make $post as \WP_Post. Otherwise something is wrong and return false
+	if ( ! $post ) {
+		global $post;
+
+		if ( empty( $post ) ) {
+			return false;
+		}
+	} else {
+		if ( is_numeric( $post ) ) {
+			$post = get_post( $post );
+
+			if ( empty( $post ) ) {
+				return false;
+			}
+		}
+	}
+
+	if ( empty( $post->ID ) ) {
+		return false;
+	}
+
+	return um_get_predefined_page_id( $slug ) === $post->ID;
+}
+
+/**
+ * Get predefined page URL
+ *
+ * @param string $slug
+ *
+ * @return false|string
+ */
+function um_get_predefined_page_url( $slug ) {
+	$url = false;
+
+	if ( $page_id = um_get_predefined_page_id( $slug ) ) {
+		$url = get_permalink( $page_id );
+	}
+
+	return $url;
+}