Nested Attributes

Attributes can handle nested new calls since PHP 8.1. They can use literals, constants and now, full objects as part of the attribute expression.

PHP code

<?php

#[JoinTable(joinColumns: [new JoinColumn])]
class x {
	function __construct() {
		print __METHOD__;
	}
}

new x;

?>

Before

PHP Fatal error:  Constant expression contains invalid operations

Fatal error: Constant expression contains invalid operations

After

x::__construct

PHP version change

This behavior changed in 8.1.

Error Messages

• Constant expression contains invalid operations

Extension