is_local_attachment() WP 1.0

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

No Hooks.

Return

true/false. True on success, false on failure.

Usage

is_local_attachment( $url );

$url(string) (required)

URL to check

Code of is_local_attachment: wp-includes/post.php ^{VER 4.9.8}

<?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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