112 lines
2.6 KiB
PHP
112 lines
2.6 KiB
PHP
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<?php
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/**
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* WPSEO plugin file.
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*
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* @package WPSEO
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*/
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/**
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* WPSEO_Content_Images.
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*/
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class WPSEO_Content_Images {
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/**
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* Retrieves images from the post content.
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*
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* @param int $post_id The post ID.
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* @param \WP_Post|null $post The post object.
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*
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* @return array An array of images found in this post.
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*/
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public function get_images( $post_id, $post = null ) {
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return $this->get_images_from_content( $this->get_post_content( $post_id, $post ) );
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}
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/**
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* Grabs the images from the content.
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*
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* @param string $content The post content string.
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*
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* @return array An array of image URLs.
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*/
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public function get_images_from_content( $content ) {
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if ( ! is_string( $content ) ) {
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return [];
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}
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$content_images = $this->get_img_tags_from_content( $content );
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$images = array_map( [ $this, 'get_img_tag_source' ], $content_images );
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$images = array_filter( $images );
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$images = array_unique( $images );
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$images = array_values( $images ); // Reset the array keys.
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return $images;
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}
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/**
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* Gets the image tags from a given content string.
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*
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* @param string $content The content to search for image tags.
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*
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* @return array An array of `<img>` tags.
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*/
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private function get_img_tags_from_content( $content ) {
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if ( strpos( $content, '<img' ) === false ) {
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return [];
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}
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preg_match_all( '`<img [^>]+>`', $content, $matches );
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if ( isset( $matches[0] ) ) {
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return $matches[0];
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}
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return [];
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}
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/**
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* Retrieves the image URL from an image tag.
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*
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* @param string $image Image HTML element.
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*
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* @return string|bool The image URL on success, false on failure.
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*/
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private function get_img_tag_source( $image ) {
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preg_match( '`src=(["\'])(.*?)\1`', $image, $matches );
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if ( isset( $matches[2] ) && filter_var( $matches[2], FILTER_VALIDATE_URL ) ) {
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return $matches[2];
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}
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return false;
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}
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/**
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* Retrieves the post content we want to work with.
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*
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* @param int $post_id The post ID.
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* @param WP_Post|array|null $post The post.
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*
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* @return string The content of the supplied post.
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*/
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private function get_post_content( $post_id, $post ) {
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if ( $post === null ) {
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$post = get_post( $post_id );
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}
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if ( $post === null ) {
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return '';
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}
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/**
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* Filter: 'wpseo_pre_analysis_post_content' - Allow filtering the content before analysis.
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*
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* @api string $post_content The Post content string.
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*/
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$content = apply_filters( 'wpseo_pre_analysis_post_content', $post->post_content, $post );
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if ( ! is_string( $content ) ) {
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$content = '';
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}
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return $content;
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}
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}
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