wp-includes/media.php:1250Gets the URL of an image attachment.
$attachment_idint$sizestring|int[]optional'thumbnail'$iconbooloptionalfalsestring|falsefunction wp_get_attachment_image_url( $attachment_id, $size = 'thumbnail', $icon = false ) { $image = wp_get_attachment_image_src( $attachment_id, $size, $icon ); return $image[0] ?? false;}Introduced in 4.4.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/media.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.