wp_get_attachment_url( int $attachment_id )
Retrieve the URL for an attachment.
Contents
Parameters
- $attachment_id
-
(int) (Optional) Attachment post ID. Defaults to global $post.
Return
(string|false) Attachment URL, otherwise false.
More Information
You can change the output of this function through the wp get attachment url filter.
This function will not URL encode the URL. If you have attachments with invalid characters in their name, you should raw URL encode the output of this function in order to have a valid URL.
Sample code that gives you a root-relative URL to your attachment:
<pre>$parsed = parse_url( wp_get_attachment_url( $attachment->ID ) ); $url = dirname( $parsed [ 'path' ] ) . '/' . rawurlencode( basename( $parsed[ 'path' ] ) );</pre> <pre>
If you want a URI for the attachment page, not the attachment file itself, you can use get_attachment_link.
Also refer: wp_insert_attachment, wp_upload_dir, wp_get_attachment_image_src
Source
File: wp-includes/post.php
function wp_get_attachment_url( $attachment_id = 0 ) {
global $pagenow;
$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 ( ! $url ) {
$url = get_the_guid( $post->ID );
}
// On SSL front end, URLs should be HTTPS.
if ( is_ssl() && ! is_admin() && 'wp-login.php' !== $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 ( ! $url ) {
return false;
}
return $url;
}
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Changelog
| Version | Description |
|---|---|
| 2.1.0 | Introduced. |
User Contributed Notes
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Use Post Thumbnail as Background Image
if ( have_posts() ) : while ( have_posts() ) : the_post(); if ( has_post_thumbnail() ) { $feat_image_url = wp_get_attachment_url( get_post_thumbnail_id() ); echo '<div style="background-image:url('.$feat_image_url.');"></div>'; } endwhile; endif;Basic Example
Outputs something like http://example.net/wp-content/uploads/filename