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<?php
if ( ! function_exists( 'get_preview_post_link' ) ) :
/**
* Retrieves the URL used for the post preview.
*
* Allows additional query args to be appended.
*
* @since 4.4.0
*
* @param int|WP_Post $post Optional. Post ID or `WP_Post` object. Defaults to global `$post`.
* @param array $query_args Optional. Array of additional query args to be appended to the link.
* Default empty array.
* @param string $preview_link Optional. Base preview link to be used if it should differ from the
* post permalink. Default empty.
* @return string|null URL used for the post preview, or null if the post does not exist.
*/
function get_preview_post_link( $post = null, $query_args = array(), $preview_link = '' ) {
$post = get_post( $post );
if ( ! $post ) {
return;
}
$post_type_object = get_post_type_object( $post->post_type );
if ( is_post_type_viewable( $post_type_object ) ) {
if ( ! $preview_link ) {
$preview_link = set_url_scheme( get_permalink( $post ) );
}
$query_args['preview'] = 'true';
$preview_link = add_query_arg( $query_args, $preview_link );
}
/**
* Filters the URL used for a post preview.
*
* @since 2.0.5
* @since 4.0.0 Added the `$post` parameter.
*
* @param string $preview_link URL used for the post preview.
* @param WP_Post $post Post object.
*/
return apply_filters( 'preview_post_link', $preview_link, $post );
}
endif;
if ( ! function_exists( 'is_post_type_viewable' ) ) :
/**
* Determines whether a post type is considered "viewable".
*
* For built-in post types such as posts and pages, the 'public' value will be evaluated.
* For all others, the 'publicly_queryable' value will be used.
*
* @since 4.4.0
* @since 4.5.0 Added the ability to pass a post type name in addition to object.
* @since 4.6.0 Converted the `$post_type` parameter to accept a WP_Post_Type object.
*
* @param string|WP_Post_Type $post_type Post type name or object.
* @return bool Whether the post type should be considered viewable.
*/
function is_post_type_viewable( $post_type ) {
if ( is_scalar( $post_type ) ) {
$post_type = get_post_type_object( $post_type );
if ( ! $post_type ) {
return false;
}
}
return $post_type->publicly_queryable || ( $post_type->_builtin && $post_type->public );
}
endif;
/**
* wp_make_content_images_responsive in WP 4.4.0+
*/
if ( ! function_exists( 'wp_make_content_images_responsive' ) ) :
function wp_make_content_images_responsive( $content ) {
return $content;
}
endif;
if ( ! function_exists( 'wp_doing_ajax' ) ) :
/**
* Determines whether the current request is a WordPress Ajax request.
*
* @since 4.7.0
*
* @return bool True if it's a WordPress Ajax request, false otherwise.
*/
function wp_doing_ajax() {
/**
* Filters whether the current request is a WordPress Ajax request.
*
* @since 4.7.0
*
* @param bool $wp_doing_ajax Whether the current request is a WordPress Ajax request.
*/
return apply_filters( 'wp_doing_ajax', defined( 'DOING_AJAX' ) && DOING_AJAX );
}
endif;
if ( ! function_exists( 'sanitize_hex_color' ) ) :
/**
* Sanitizes a hex color.
*
* Returns either '', a 3 or 6 digit hex color (with #), or nothing.
* For sanitizing values without a #, see sanitize_hex_color_no_hash().
*
* @since 3.4.0
*
* @param string $color
* @return string|void
*/
function sanitize_hex_color( $color ) {
if ( '' === $color ) {
return '';
}
// 3 or 6 hex digits, or the empty string.
if ( preg_match('|^#([A-Fa-f0-9]{3}){1,2}$|', $color ) ) {
return $color;
}
}
endif;