khaihihi

wp-content/plugins/wordpress-seo/admin/links/class-link-extractor.php

@@ -0,0 +1,52 @@
+<?php
+/**
+ * WPSEO plugin file.
+ *
+ * @package WPSEO\Admin\Links
+ */
+
+/**
+ * Represents the link extractor.
+ */
+class WPSEO_Link_Extractor {
+
+	/**
+	 * The content to extract the links from.
+	 *
+	 * @var string
+	 */
+	protected $content;
+
+	/**
+	 * Sets the content.
+	 *
+	 * @param string $content The content to extract the links from.
+	 */
+	public function __construct( $content ) {
+		$this->content = $content;
+	}
+
+	/**
+	 * Extracts the hrefs from the content and returns them as an array.
+	 *
+	 * @return array All the extracted links
+	 */
+	public function extract() {
+		$links = [];
+
+		if ( strpos( $this->content, 'href' ) === false ) {
+			return $links;
+		}
+
+		$regexp = '<a\s[^>]*href=("??)([^" >]*?)\\1[^>]*>';
+
+		// Used modifiers iU to match case insensitive and make greedy quantifiers lazy.
+		if ( preg_match_all( "/$regexp/iU", $this->content, $matches, PREG_SET_ORDER ) ) {
+			foreach ( $matches as $match ) {
+				$links[] = trim( $match[2], "'" );
+			}
+		}
+
+		return $links;
+	}
+}