wp_get_attachment_url( int $attachment_id )

Retrieve the URL for an attachment.

Description

Parameters

$attachment_id

(int) (Optional) Attachment post ID. Defaults to global $post.

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Return

(string|false) Attachment URL, otherwise false.

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Source

File: wp-includes/post.php 

function wp_get_attachment_url( $attachment_id = 0 ) {
	$attachment_id = (int) $attachment_id;
	$post          = get_post( $attachment_id );
	if ( ! $post ) {
		return false;
	}

	if ( 'attachment' != $post->post_type ) {
		return false;
	}

	$url = '';
	// Get attached file.
	$file = get_post_meta( $post->ID, '_wp_attached_file', true );
	if ( $file ) {
		// Get upload directory.
		$uploads = wp_get_upload_dir();
		if ( $uploads && false === $uploads['error'] ) {
			// Check that the upload base exists in the file location.
			if ( 0 === strpos( $file, $uploads['basedir'] ) ) {
				// Replace file location with url location.
				$url = str_replace( $uploads['basedir'], $uploads['baseurl'], $file );
			} elseif ( false !== strpos( $file, 'wp-content/uploads' ) ) {
				// Get the directory name relative to the basedir (back compat for pre-2.7 uploads)
				$url = trailingslashit( $uploads['baseurl'] . '/' . _wp_get_attachment_relative_path( $file ) ) . wp_basename( $file );
			} else {
				// It's a newly-uploaded file, therefore $file is relative to the basedir.
				$url = $uploads['baseurl'] . "/$file";
			}
		}
	}

	/*
	 * If any of the above options failed, Fallback on the GUID as used pre-2.7,
	 * not recommended to rely upon this.
	 */
	if ( empty( $url ) ) {
		$url = get_the_guid( $post->ID );
	}

	// On SSL front end, URLs should be HTTPS.
	if ( is_ssl() && ! is_admin() && 'wp-login.php' !== $GLOBALS['pagenow'] ) {
		$url = set_url_scheme( $url );
	}

	/**
	 * Filters the attachment URL.
	 *
	 * @since 2.1.0
	 *
	 * @param string $url           URL for the given attachment.
	 * @param int    $attachment_id Attachment post ID.
	 */
	$url = apply_filters( 'wp_get_attachment_url', $url, $post->ID );

	if ( empty( $url ) ) {
		return false;
	}

	return $url;
}

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Changelog

Version Description
2.1.0 Introduced.

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Uses

Uses Description
wp-includes/functions.php: wp_get_upload_dir()

Retrieves uploads directory information.
wp-includes/media.php: _wp_get_attachment_relative_path()

Get the attachment path relative to the upload directory.
wp-includes/formatting.php: wp_basename()

i18n friendly version of basename()
wp-includes/formatting.php: trailingslashit()

Appends a trailing slash.
wp-includes/load.php: is_admin()

Determines whether the current request is for an administrative interface page.
wp-includes/load.php: is_ssl()

Determines if SSL is used.
wp-includes/link-template.php: set_url_scheme()

Sets the scheme for a URL.
wp-includes/plugin.php: apply_filters()

Calls the callback functions that have been added to a filter hook.
wp-includes/post-template.php: get_the_guid()

Retrieve the Post Global Unique Identifier (guid).
wp-includes/post.php: wp_get_attachment_url

Filters the attachment URL.
wp-includes/post.php: get_post_meta()

Retrieves a post meta field for the given post ID.
wp-includes/post.php: get_post()

Retrieves post data given a post ID or post object.

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Used By

Used By Description
wp-includes/post.php: wp_get_original_image_url()

Retrieve the URL to an original attachment image.
wp-includes/media.php: wp_media_personal_data_exporter()

Finds and exports attachments associated with an email address.
wp-includes/widgets/class-wp-widget-media-audio.php: WP_Widget_Media_Audio::render_media()

Render the media on the frontend.
wp-includes/widgets/class-wp-widget-media-video.php: WP_Widget_Media_Video::render_media()

Render the media on the frontend.
wp-includes/widgets/class-wp-widget-media-image.php: WP_Widget_Media_Image::render_media()

Render the media on the frontend.
wp-includes/class-wp-customize-manager.php: WP_Customize_Manager::import_theme_starter_content()

Import theme starter content into the customized state.
wp-includes/theme.php: get_header_video_url()

Retrieve header video URL for custom header.
wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php: WP_REST_Attachments_Controller::prepare_item_for_response()

Prepares a single attachment output for response.
wp-admin/includes/class-wp-site-icon.php: WP_Site_Icon::create_attachment_object()

Creates an attachment ‘object’.
wp-admin/includes/ajax-actions.php: wp_ajax_crop_image()

Ajax handler for cropping an image.
wp-admin/includes/export.php: export_wp()

Generates the WXR export file for download.
wp-admin/includes/image-edit.php: wp_save_image()

Saves image to post along with enqueued changes in $_REQUEST[‘history’]
wp-admin/includes/image.php: _load_image_to_edit_path()

Retrieve the path or url of an attachment’s attached file.
wp-admin/includes/template.php: _media_states()

Function to echo the attachment media states as HTML.
wp-admin/includes/media.php: edit_form_image_editor()

Displays the image and editor in the post editor
wp-admin/includes/media.php: attachment_submitbox_metadata()

Displays non-editable attachment metadata in the publish meta box.
wp-admin/includes/media.php: get_attachment_fields_to_edit()

Retrieves the attachment fields to edit form fields.
wp-admin/includes/media.php: media_sideload_image()

Downloads an image from the specified URL and attaches it to a post.
wp-admin/includes/media.php: image_link_input_fields()

Retrieve HTML for the Link URL buttons with the default link type as specified.
wp-admin/includes/class-custom-image-header.php: Custom_Image_Header::create_attachment_object()

Create an attachment ‘object’.
wp-admin/includes/class-custom-image-header.php: Custom_Image_Header::ajax_header_crop()

Gets attachment uploaded by Media Manager, crops it, then saves it as a new object. Returns JSON-encoded object details.
wp-admin/includes/class-custom-image-header.php: Custom_Image_Header::step_3()

Display third step of custom header image page.
wp-includes/theme.php: _delete_attachment_theme_mod()

Checks an attachment being deleted to see if it’s a header or background image.
wp-includes/theme.php: get_uploaded_header_images()

Get the header images uploaded for the current theme.
wp-includes/deprecated.php: get_the_attachment_link()

Retrieve HTML content of attachment image with link.
wp-includes/deprecated.php: get_attachment_icon_src()

Retrieve icon URL and Path.
wp-includes/post-template.php: wp_get_attachment_link()

Retrieve an attachment page link using an image or icon, if possible.
wp-includes/post-template.php: prepend_attachment()

Wrap attachment in paragraph tag before content.
wp-includes/media.php: wp_prepare_attachment_for_js()

Prepares an attachment post object for JS, where it is expected to be JSON-encoded and fit into an Attachment model.
wp-includes/media.php: wp_video_shortcode()

Builds the Video shortcode output.
wp-includes/media.php: wp_playlist_shortcode()

Builds the Playlist shortcode output.
wp-includes/media.php: wp_audio_shortcode()

Builds the Audio shortcode output.
wp-includes/media.php: image_get_intermediate_size()

Retrieves the image’s intermediate size (resized) path, width, and height.
wp-includes/media.php: image_downsize()

Scale an image to fit a particular size (such as ‘thumb’ or ‘medium’).
wp-includes/post.php: wp_get_attachment_thumb_url()

Retrieve URL for an attachment thumbnail.
wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::_prepare_media_item()

Prepares media item data for return in an XML-RPC object.