wp_get_attachment_url() – Retrieve the URL for an attachment.

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Description

Retrieves the URL for an attachment.

Usage

$string|false = wp_get_attachment_url( $attachment_id );

Parameters

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

Returns

string|false Attachment URL, otherwise false.

Source

File name: wordpress/wp-includes/post.php
Lines:

1 to 65 of 65
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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