149 lines
4.1 KiB
PHP
149 lines
4.1 KiB
PHP
<?php
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/**
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* The class handles changes in image tag attributes.
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*
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* @since 1.0.15
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* @package RankMath
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* @subpackage RankMath\Image_Seo
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* @author Rank Math <support@rankmath.com>
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*/
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namespace RankMath\Image_Seo;
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use stdClass;
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use RankMath\Helper;
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use RankMath\Traits\Hooker;
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use RankMath\Helpers\HTML;
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defined( 'ABSPATH' ) || exit;
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/**
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* Add Attributes class.
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*/
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class Add_Attributes {
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use Hooker;
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/**
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* Stores the image alt format if it is set.
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*
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* @var string|false
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*/
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public $is_alt;
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/**
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* Stores the image title format if it is set.
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*
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* @var string|false
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*/
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public $is_title;
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/**
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* The Constructor.
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*/
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public function __construct() {
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$this->action( 'wp', 'add_attributes', 9999 );
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$this->action( 'rest_api_init', 'add_attributes' );
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}
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/**
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* Add nofollow, target, title and alt attributes to images.
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*/
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public function add_attributes() {
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// Add image title and alt.
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$this->is_alt = Helper::get_settings( 'general.add_img_alt' ) && Helper::get_settings( 'general.img_alt_format' ) ? trim( Helper::get_settings( 'general.img_alt_format' ) ) : false;
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$this->is_title = Helper::get_settings( 'general.add_img_title' ) && Helper::get_settings( 'general.img_title_format' ) ? trim( Helper::get_settings( 'general.img_title_format' ) ) : false;
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if ( $this->is_alt || $this->is_title ) {
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$this->filter( 'the_content', 'add_img_attributes', 11 );
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$this->filter( 'post_thumbnail_html', 'add_img_attributes', 11, 2 );
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$this->filter( 'woocommerce_single_product_image_thumbnail_html', 'add_img_attributes', 11 );
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}
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}
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/**
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* Add 'title' and 'alt' attribute to image.
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*
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* @param string $content Post content.
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* @param null|int $post_id The current post ID.
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* @return string
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*/
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public function add_img_attributes( $content, $post_id = null ) {
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if ( empty( $content ) ) {
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return $content;
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}
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$stripped_content = preg_replace( '@<(script|style)[^>]*?>.*?</\\1>@si', '', $content );
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preg_match_all( '/<img ([^>]+)\/?>/iU', $stripped_content, $matches, PREG_SET_ORDER );
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if ( empty( $matches ) ) {
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return $content;
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}
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$post = $this->get_post( $post_id );
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foreach ( $matches as $image ) {
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$is_dirty = false;
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$attrs = HTML::extract_attributes( $image[0] );
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if ( ! isset( $attrs['src'] ) && ! isset( $attrs['data-ct-lazy'] ) ) {
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continue;
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}
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$post->filename = isset( $attrs['data-ct-lazy'] ) ? $attrs['data-ct-lazy'] : $attrs['src'];
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// Lazy load support.
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if ( ! empty( $attrs['data-src'] ) ) {
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$post->filename = $attrs['data-src'];
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} elseif ( ! empty( $attrs['data-layzr'] ) ) {
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$post->filename = $attrs['data-layzr'];
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} elseif ( ! empty( $attrs['nitro-lazy-srcset'] ) ) {
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$post->filename = $attrs['nitro-lazy-srcset'];
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}
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// Pass attributes so they can be used later.
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$post->alttext = isset( $attrs['alt'] ) ? $attrs['alt'] : '';
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$post->titletext = isset( $attrs['title'] ) ? $attrs['title'] : '';
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$this->set_image_attribute( $attrs, 'alt', $this->is_alt, $is_dirty, $post );
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$this->set_image_attribute( $attrs, 'title', $this->is_title, $is_dirty, $post );
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if ( $is_dirty ) {
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$new = '<img' . HTML::attributes_to_string( $attrs ) . '>';
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$content = str_replace( $image[0], $new, $content );
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}
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}
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return $content;
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}
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/**
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* Get post object.
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*
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* @param null|int $post_id The post ID.
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* @return object
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*/
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private function get_post( $post_id = null ) {
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$post = \get_post( $post_id );
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if ( empty( $post ) ) {
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$post = new stdClass();
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}
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return $post;
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}
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/**
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* Set image attribute after checking condition.
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*
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* @param array $attrs Array which hold rel attribute.
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* @param string $attribute Attribute to set.
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* @param boolean $condition Condition to check.
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* @param boolean $is_dirty Is dirty variable.
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* @param object $post Post Object.
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*/
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private function set_image_attribute( &$attrs, $attribute, $condition, &$is_dirty, $post ) {
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if ( $condition && empty( $attrs[ $attribute ] ) ) {
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$is_dirty = true;
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$attrs[ $attribute ] = trim( Helper::replace_vars( $condition, $post ) );
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}
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}
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}
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