is_local_attachment( string $url )

Determines whether an attachment URI is local and really an attachment.

Description

For more information on this and similar theme functions, check out the Conditional Tags article in the Theme Developer Handbook.

Parameters

$url

(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;
}

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Related

Uses

Uses
Uses Description
wp-includes/compat.php: str_contains()

Polyfill for str_contains() function added in PHP 8.0.
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()

Examines 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
2.0.0 Introduced.