wp_get_attachment_url() WP 1.0
Retrieve the URL for an attachment.
✈ 1 time = 0.000858s = slow | 50000 times = 0.77s = very fast | PHP 7.0.8, WP 4.6
Hooks in function
Return
String/false. Attachment URL, otherwise false.
Usage
wp_get_attachment_url( $attachment_id );
- $attachment_id(int)
- Attachment post ID.
Default: global $post
Code of wp get attachment url:
wp-includes/post.php
VER 5.0.3
<?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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