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wp-content/plugins/table-of-contents-plus/includes/functions.php

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+<?php
+
+/**
+ * Returns a HTML formatted string of the table of contents without the surrounding UL or OL
+ * tags to enable the theme editor to supply their own ID and/or classes to the outer list.
+ *
+ * There are three optional parameters you can feed this function with:
+ *
+ *  - $content is the entire content with headings.  If blank, will default to the current $post
+ *
+ *  - $link is the URL to prefix the anchor with.  If provided a string, will use it as the prefix.
+ *    If set to true then will try to obtain the permalink from the $post object.
+ *
+ *  - $apply_eligibility bool, defaults to false.  When set to true, will apply the check to
+ *    see if bit of content has the prerequisites needed for a TOC, eg minimum number of headings
+ *    enabled post type, etc.
+ */
+function toc_get_index( $content = '', $prefix_url = '', $apply_eligibility = false ) {
+	global $wp_query, $toc_plus;
+
+	$return  = '';
+	$find    = [];
+	$replace = [];
+	$proceed = true;
+
+	if ( ! $content ) {
+		$post    = get_post( $wp_query->post->ID );
+		$content = wptexturize( $post->post_content );
+	}
+
+	if ( $apply_eligibility ) {
+		if ( ! $toc_plus->is_eligible() ) {
+			$proceed = false;
+		}
+	} else {
+		$toc_plus->set_option( [ 'start' => 0 ] );
+	}
+
+	if ( $proceed ) {
+		$return = $toc_plus->extract_headings( $find, $replace, $content );
+		if ( $prefix_url ) {
+			$return = str_replace( 'href="#', 'href="' . $prefix_url . '#', $return );
+		}
+	}
+
+	return $return;
+}