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_wp_get_attachment_relative_path( string $file )

This function’s access is marked private. This means it is not intended for use by plugin or theme developers, only in other core functions. It is listed here for completeness.

Get the attachment path relative to the upload directory.

Parameters

$file

(string) (Required) Attachment file name.

Return

(string) Attachment path relative to the upload directory.

Source

File: wp-includes/media.php 

function _wp_get_attachment_relative_path( $file ) {
	$dirname = dirname( $file );

	if ( '.' === $dirname ) {
		return '';
	}

	if ( false !== strpos( $dirname, 'wp-content/uploads' ) ) {
		// Get the directory name relative to the upload directory (back compat for pre-2.7 uploads).
		$dirname = substr( $dirname, strpos( $dirname, 'wp-content/uploads' ) + 18 );
		$dirname = ltrim( $dirname, '/' );
	}

	return $dirname;
}

Changelog

Version Description
4.4.1 Introduced.

© 2003–2019 WordPress Foundation
Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/functions/_wp_get_attachment_relative_path