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<?php

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/**

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* WPSEO plugin file.

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* @package WPSEO

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/**

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* WPSEO_Content_Images.

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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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* @param int $post_id The post ID.

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* @param WP_Post|null $post The post object.

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* @return array An array of images found in this post.

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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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* @param string $content The post content string.

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* @return array An array of image URLs.

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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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* @param string $content The content to search for image tags.

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* @return array An array of `<img>` tags.

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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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* @param string $image Image HTML element.

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* @return string|bool The image URL on success, false on failure.

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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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* @param int $post_id The post ID.

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* @param WP_Post|array|null $post The post.

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* @return string The content of the supplied post.

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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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* @param string $post_content The Post content string.

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* @param WP_Post $post The current post.

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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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