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ðŸ“ ..
ðŸ“„ class-addon-manager.php(26.07 KB)
ðŸ“„ class-my-yoast-api-request.php(4.77 KB)
ðŸ“„ class-post-type.php(3.89 KB)
ðŸ“„ class-rewrite.php(7.58 KB)
ðŸ“„ class-upgrade-history.php(3.04 KB)
ðŸ“„ class-upgrade.php(55.17 KB)
ðŸ“„ class-wpseo-admin-bar-menu.php(26.55 KB)
ðŸ“„ class-wpseo-content-images.php(2.62 KB)
ðŸ“„ class-wpseo-custom-fields.php(1.73 KB)
ðŸ“„ class-wpseo-custom-taxonomies.php(1.59 KB)
ðŸ“„ class-wpseo-image-utils.php(15.09 KB)
ðŸ“„ class-wpseo-installation.php(1.11 KB)
ðŸ“„ class-wpseo-meta.php(34.17 KB)
ðŸ“„ class-wpseo-primary-term.php(1.7 KB)
ðŸ“„ class-wpseo-rank.php(7.37 KB)
ðŸ“„ class-wpseo-replace-vars.php(51.41 KB)
ðŸ“„ class-wpseo-replacement-variable.php(1.34 KB)
ðŸ“„ class-wpseo-shortlinker.php(1.11 KB)
ðŸ“„ class-wpseo-statistics.php(1.41 KB)
ðŸ“„ class-wpseo-utils.php(28.53 KB)
ðŸ“„ class-yoast-dynamic-rewrites.php(5.24 KB)
ðŸ“„ date-helper.php(1.71 KB)
ðŸ“ exceptions
ðŸ“„ index.php(38 B)
ðŸ“„ interface-wpseo-wordpress-ajax-integration.php(294 B)
ðŸ“„ interface-wpseo-wordpress-integration.php(348 B)
ðŸ“„ language-utils.php(1.28 KB)
ðŸ“ options
ðŸ“ sitemaps
ðŸ“„ wpseo-functions-deprecated.php(68 B)
ðŸ“„ wpseo-functions.php(9 KB)
ðŸ“„ wpseo-non-ajax-functions.php(1.56 KB)

Editing: class-wpseo-content-images.php

<?php
/**
 * WPSEO plugin file.
 *
 * @package WPSEO
 */

/**
 * WPSEO_Content_Images.
 */
class WPSEO_Content_Images {

/**
	 * Retrieves images from the post content.
	 *
	 * @param int          $post_id The post ID.
	 * @param WP_Post|null $post    The post object.
	 *
	 * @return array An array of images found in this post.
	 */
	public function get_images( $post_id, $post = null ) {
		return $this->get_images_from_content( $this->get_post_content( $post_id, $post ) );
	}

/**
	 * Grabs the images from the content.
	 *
	 * @param string $content The post content string.
	 *
	 * @return array An array of image URLs.
	 */
	public function get_images_from_content( $content ) {
		if ( ! is_string( $content ) ) {
			return [];
		}

$content_images = $this->get_img_tags_from_content( $content );

$images = array_map( [ $this, 'get_img_tag_source' ], $content_images );
		$images = array_filter( $images );
		$images = array_unique( $images );
		$images = array_values( $images ); // Reset the array keys.
		return $images;
	}

/**
	 * Gets the image tags from a given content string.
	 *
	 * @param string $content The content to search for image tags.
	 *
	 * @return array An array of `<img>` tags.
	 */
	private function get_img_tags_from_content( $content ) {
		if ( strpos( $content, '<img' ) === false ) {
			return [];
		}

preg_match_all( '`<img [^>]+>`', $content, $matches );
		if ( isset( $matches[0] ) ) {
			return $matches[0];
		}

return [];
	}

/**
	 * Retrieves the image URL from an image tag.
	 *
	 * @param string $image Image HTML element.
	 *
	 * @return string|bool The image URL on success, false on failure.
	 */
	private function get_img_tag_source( $image ) {
		preg_match( '`src=(["\'])(.*?)\1`', $image, $matches );
		if ( isset( $matches[2] ) && filter_var( $matches[2], FILTER_VALIDATE_URL ) ) {
			return $matches[2];
		}
		return false;
	}

/**
	 * Retrieves the post content we want to work with.
	 *
	 * @param int                $post_id The post ID.
	 * @param WP_Post|array|null $post    The post.
	 *
	 * @return string The content of the supplied post.
	 */
	private function get_post_content( $post_id, $post ) {
		if ( $post === null ) {
			$post = get_post( $post_id );
		}

if ( $post === null ) {
			return '';
		}

/**
		 * Filter: 'wpseo_pre_analysis_post_content' - Allow filtering the content before analysis.
		 *
		 * @param string  $post_content The Post content string.
		 * @param WP_Post $post         The current post.
		 */
		$content = apply_filters( 'wpseo_pre_analysis_post_content', $post->post_content, $post );

if ( ! is_string( $content ) ) {
			$content = '';
		}

return $content;
	}
}

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Editing: class-wpseo-content-images.php

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