wp_get_attachment_url( int $attachment_id )
Retrieve the URL for an attachment.
Description Description
Parameters Parameters
- $attachment_id
-
(int) (Optional) Attachment post ID. Defaults to global $post.
Return Return
(string|false) Attachment URL, otherwise false.
Source Source
File: wp-includes/post.php
function wp_get_attachment_url( $attachment_id = 0 ) {
$attachment_id = (int) $attachment_id;
if ( ! $post = get_post( $attachment_id ) ) {
return false;
}
if ( 'attachment' != $post->post_type )
return false;
$url = '';
// Get attached file.
if ( $file = get_post_meta( $post->ID, '_wp_attached_file', true ) ) {
// Get upload directory.
if ( ( $uploads = wp_get_upload_dir() ) && 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 ) ) . 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 Changelog
| Version | Description |
|---|---|
| 2.1.0 | Introduced. |
User Contributed Notes User Contributed Notes
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Basic Example
Outputs something like http://example.net/wp-content/uploads/filename
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;You can also use it as a background