WIP: Check for metadata

doctor.yml

@@ -42,3 +42,5 @@ php-in-upload:
   check: PHP_In_Upload
 language-update:
   check: Language_Update
+meta-tags:
+  check: Check_Meta_Tags

inc/checks/class-check-meta-tags.php

@@ -0,0 +1,68 @@
+<?php
+
+namespace runcommand\Doctor\Checks;
+
+use WP_CLI;
+
+/**
+ * Warns when there are greater than %threshold_count% plugins activated.
+ */
+class Check_Meta_Tags extends Plugin {
+
+	// Meta tags reg. ex.
+	private $metatags_expression = "/<meta[^>]+(?:name|property)=\"([^\"]*)\"[^>]+content=\"([^\"]*)\"[^>]*>/";
+
+	public function run() {
+
+		// Fetch homepage resposne.
+		$response = wp_remote_get(site_url());
+
+		if ( ! is_wp_error( $response ) ) {
+
+			// Get the homepage source.
+			$body = wp_remote_retrieve_body( $response );
+
+			$meta_tags = $this->getMetaTags( $body );
+
+		}
+
+		$this->set_status( 'success' );
+		$this->set_message( 'Meta tags checking initiated.' );
+
+	}
+
+	/**
+	 * Extract all metatags sources from content
+	 *
+	 * @param string $content full body source of webpage.
+	 * @return array, an array of extracted metatags
+	 */
+
+	public function getMetaTags( $content = '' ) {
+
+		$metatags = array();
+
+		if ( empty( $content ) ) {
+			return;
+		}
+
+		preg_match_all( $this->metatags_expression, $content, $match_tags );
+
+		if ( isset( $match_tags[2] ) && count( $match_tags[2]) ) {
+
+			foreach ( $match_tags[2] as $key => $match_tag ) {
+
+				$key = trim( $match_tags[1][ $key ] );
+				$match_tag = trim( $match_tag );
+
+				if ( $match_tag ) {
+					$metatags[] = array( $key, $match_tag );
+				}
+			}
+		}
+
+		return $metatags;
+
+	}
+
+}