bbp_form_slug_conflict_check( string $slug, string $default )

function bbp_form_slug_conflict_check( $slug, $default ) {

	// Only set the slugs once ver page load
	static $the_core_slugs = array();

	// Get the form value
	$this_slug = bbp_get_form_option( $slug, $default, true );

	if ( empty( $the_core_slugs ) ) {

		// Slugs to check
		$core_slugs = apply_filters( 'bbp_slug_conflict_check', array(

			/** WordPress Core ****************************************************/

			// Core Post Types
			'post_base'       => array( 'name' => __( 'Posts',         'buddyboss' ), 'default' => 'post',          'context' => 'WordPress' ),
			'page_base'       => array( 'name' => __( 'Pages',         'buddyboss' ), 'default' => 'page',          'context' => 'WordPress' ),
			'revision_base'   => array( 'name' => __( 'Revisions',     'buddyboss' ), 'default' => 'revision',      'context' => 'WordPress' ),
			'attachment_base' => array( 'name' => __( 'Attachments',   'buddyboss' ), 'default' => 'attachment',    'context' => 'WordPress' ),
			'nav_menu_base'   => array( 'name' => __( 'Menus',         'buddyboss' ), 'default' => 'nav_menu_item', 'context' => 'WordPress' ),

			// Post Tags
			'tag_base'        => array( 'name' => __( 'Tag base',      'buddyboss' ), 'default' => 'tag',           'context' => 'WordPress' ),

			// Post Categories
			'category_base'   => array( 'name' => __( 'Category base', 'buddyboss' ), 'default' => 'category',      'context' => 'WordPress' ),

			/** Forums Core ******************************************************/

			// Forum archive slug
			'_bbp_root_slug'          => array( 'name' => __( 'Forums base', 'buddyboss' ), 'default' => 'forums', 'context' => 'Forums' ),

			// Topic archive slug
			'_bbp_topic_archive_slug' => array( 'name' => __( 'Discussions base', 'buddyboss' ), 'default' => 'discussions', 'context' => 'Forums' ),

			// Forum slug
			'_bbp_forum_slug'         => array( 'name' => __( 'Forum slug',  'buddyboss' ), 'default' => 'forum',  'context' => 'Forums' ),

			// Topic slug
			'_bbp_topic_slug'         => array( 'name' => __( 'Discussion slug',  'buddyboss' ), 'default' => 'discussion',  'context' => 'Forums' ),

			// Reply slug
			'_bbp_reply_slug'         => array( 'name' => __( 'Reply slug',  'buddyboss' ), 'default' => 'reply',  'context' => 'Forums' ),

			// User profile slug
			'_bbp_user_slug'          => array( 'name' => __( 'User base',   'buddyboss' ), 'default' => 'users',  'context' => 'Forums' ),

			// View slug
			'_bbp_view_slug'          => array( 'name' => __( 'View base',   'buddyboss' ), 'default' => 'view',   'context' => 'Forums' ),

			// Topic tag slug
			'_bbp_topic_tag_slug'     => array( 'name' => __( 'Discussion tag slug', 'buddyboss' ), 'default' => 'discussion-tag', 'context' => 'Forums' ),
		) );

		/** BuddyBoss Core *******************************************************/

		if ( defined( 'BP_VERSION' ) ) {
			$bp = buddypress();

			// Loop through root slugs and check for conflict
			if ( !empty( $bp->pages ) ) {
				foreach ( $bp->pages as $page => $page_data ) {
					$page_base    = $page . '_base';
					$page_title   = sprintf( __( '%s page', 'buddyboss' ), $page_data->title );
					$core_slugs[$page_base] = array( 'name' => $page_title, 'default' => $page_data->slug, 'context' => 'BuddyPress' );
				}
			}
		}

		// Set the static
		$the_core_slugs = apply_filters( 'bbp_slug_conflict', $core_slugs );
	}

	// Loop through slugs to check
	foreach ( $the_core_slugs as $key => $value ) {

		// Get the slug
		$slug_check = bbp_get_form_option( $key, $value['default'], true );

		// Compare
		if ( ( $slug !== $key ) && ( $slug_check === $this_slug ) ) : ?>

			<span class="attention"><?php printf( esc_html__( 'Possible %1$s conflict: %2$s', 'buddyboss' ), $value['context'], '<strong>' . $value['name'] . '</strong>' ); ?></span>

		<?php endif;
	}
}