Cannot Bind $this To Static Closure¶
A static closure does not import any variables from the defining context. In particular, it doesn’t import the pseudo-variable $this. This also applies when trying to reconfigure a closure with its bindTo() method.
PHP code¶
<?php
class A {}
$fn = static function () { };
$d = $fn->bindTo(new A, 'A');
?>
Before¶
PHP Warning: Cannot bind an instance to a static closure
Warning: Cannot bind an instance to a static closure
After¶
PHP Warning: Cannot bind an instance to a static closure, this will be an error in PHP 9
Warning: Cannot bind an instance to a static closure, this will be an error in PHP 9
PHP version change¶
This behavior changed in 8.5
