the_post_thumbnail_url() – Function | Developer.WordPress.org

the_post_thumbnail_url( string|int[] $size = 'post-thumbnail' )

Displays the post thumbnail URL.

Parameters

$sizestring|int[]optional: Image size to use. Accepts any valid image size, or an array of width and height values in pixels (in that order).
Default 'post-thumbnail'.
Default:'post-thumbnail'

Source

function the_post_thumbnail_url( $size = 'post-thumbnail' ) {
	$url = get_the_post_thumbnail_url( null, $size );

	if ( $url ) {
		echo esc_url( $url );
	}
}

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