is_local_attachment( string $url )

Check if the attachment URI is local one and is really an attachment.

Parameters

$url

(string) (Required) URL to check

Return

(bool) True on success, false on failure.

Source

File: wp-includes/post.php 

function is_local_attachment($url) {
	if (strpos($url, home_url()) === false)
		return false;
	if (strpos($url, home_url('/?attachment_id=')) !== false)
		return true;
	if ( $id = url_to_postid($url) ) {
		$post = get_post($id);
		if ( 'attachment' == $post->post_type )
			return true;
	}
	return false;
}

Expand Source Code View on GitHub

Related

Uses

Uses
Uses Description
wp-includes/link-template.php: home_url()

Retrieves the URL for the current site where the front end is accessible.
wp-includes/rewrite.php: url_to_postid()

Examine a URL and try to determine the post ID it represents.
wp-includes/post.php: get_post()

Retrieves post data given a post ID or post object.

Used By

Used By
Used By Description
wp-includes/comment.php: pingback()

Pings back the links found in a post.

Changelog

Changelog
Version Description
WP-2.0.0 Introduced.