<?php

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/**

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* Robots template functions.

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*

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* @package WordPress

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* @subpackage Robots

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* @since 5.7.0

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*/

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/**

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* Displays the robots meta tag as necessary.

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*

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* Gathers robots directives to include for the current context, using the

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* {@see 'wp_robots'} filter. The directives are then sanitized, and the

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* robots meta tag is output if there is at least one relevant directive.

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*

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* @since 5.7.0

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* @since 5.7.1 No longer prevents specific directives to occur together.

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*/

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function wp_robots() {

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/**

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* Filters the directives to be included in the 'robots' meta tag.

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*

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* The meta tag will only be included as necessary.

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*

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* @since 5.7.0

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*

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* @param array $robots Associative array of directives. Every key must be the name of the directive, and the

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* corresponding value must either be a string to provide as value for the directive or a

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* boolean `true` if it is a boolean directive, i.e. without a value.

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*/

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$robots = apply_filters( 'wp_robots', array() );

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$robots_strings = array();

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foreach ( $robots as $directive => $value ) {

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if ( is_string( $value ) ) {

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// If a string value, include it as value for the directive.

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$robots_strings[] = "{$directive}:{$value}";

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} elseif ( $value ) {

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// Otherwise, include the directive if it is truthy.

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$robots_strings[] = $directive;

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}

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}

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if ( empty( $robots_strings ) ) {

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return;

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}

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echo "<meta name='robots' content='" . esc_attr( implode( ', ', $robots_strings ) ) . "' />\n";

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}

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/**

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* Adds noindex to the robots meta tag if required by the site configuration.

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*

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* If a blog is marked as not being public then noindex will be output to

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* tell web robots not to index the page content. Add this to the

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* {@see 'wp_robots'} filter.

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*

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* Typical usage is as a {@see 'wp_robots'} callback:

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*

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* add_filter( 'wp_robots', 'wp_robots_noindex' );

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*

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* @since 5.7.0

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*

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* @see wp_robots_no_robots()

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*

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* @param array $robots Associative array of robots directives.

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* @return array Filtered robots directives.

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*/

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function wp_robots_noindex( array $robots ) {

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if ( ! get_option( 'blog_public' ) ) {

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return wp_robots_no_robots( $robots );

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}

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return $robots;

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}

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/**

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* Adds noindex to the robots meta tag for embeds.

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*

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* Typical usage is as a {@see 'wp_robots'} callback:

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*

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* add_filter( 'wp_robots', 'wp_robots_noindex_embeds' );

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*

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* @since 5.7.0

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*

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* @see wp_robots_no_robots()

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*

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* @param array $robots Associative array of robots directives.

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* @return array Filtered robots directives.

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*/

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function wp_robots_noindex_embeds( array $robots ) {

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if ( is_embed() ) {

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return wp_robots_no_robots( $robots );

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}

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return $robots;

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}

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/**

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* Adds noindex to the robots meta tag if a search is being performed.

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*

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* If a search is being performed then noindex will be output to

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* tell web robots not to index the page content. Add this to the

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* {@see 'wp_robots'} filter.

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*

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* Typical usage is as a {@see 'wp_robots'} callback:

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*

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* add_filter( 'wp_robots', 'wp_robots_noindex_search' );

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*

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* @since 5.7.0

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*

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* @see wp_robots_no_robots()

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*

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* @param array $robots Associative array of robots directives.

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* @return array Filtered robots directives.

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*/

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function wp_robots_noindex_search( array $robots ) {

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if ( is_search() ) {

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return wp_robots_no_robots( $robots );

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}

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return $robots;

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}

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/**

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* Adds noindex to the robots meta tag.

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*

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* This directive tells web robots not to index the page content.

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*

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* Typical usage is as a {@see 'wp_robots'} callback:

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*

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* add_filter( 'wp_robots', 'wp_robots_no_robots' );

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*

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* @since 5.7.0

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*

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* @param array $robots Associative array of robots directives.

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* @return array Filtered robots directives.

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*/

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function wp_robots_no_robots( array $robots ) {

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$robots['noindex'] = true;

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if ( get_option( 'blog_public' ) ) {

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$robots['follow'] = true;

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} else {

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$robots['nofollow'] = true;

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}

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return $robots;

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}

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/**

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* Adds noindex and noarchive to the robots meta tag.

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*

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* This directive tells web robots not to index or archive the page content and

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* is recommended to be used for sensitive pages.

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*

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* Typical usage is as a {@see 'wp_robots'} callback:

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*

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* add_filter( 'wp_robots', 'wp_robots_sensitive_page' );

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*

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* @since 5.7.0

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*

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* @param array $robots Associative array of robots directives.

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* @return array Filtered robots directives.

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*/

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function wp_robots_sensitive_page( array $robots ) {

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$robots['noindex'] = true;

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$robots['noarchive'] = true;

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return $robots;

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}

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/**

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* Adds 'max-image-preview:large' to the robots meta tag.

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*

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* This directive tells web robots that large image previews are allowed to be

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* displayed, e.g. in search engines, unless the blog is marked as not being public.

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*

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* Typical usage is as a {@see 'wp_robots'} callback:

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*

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* add_filter( 'wp_robots', 'wp_robots_max_image_preview_large' );

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*

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* @since 5.7.0

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*

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* @param array $robots Associative array of robots directives.

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* @return array Filtered robots directives.

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*/

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function wp_robots_max_image_preview_large( array $robots ) {

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if ( get_option( 'blog_public' ) ) {

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$robots['max-image-preview'] = 'large';

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}

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return $robots;

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}

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