static_lambda
Lambdas not (indirect) referencing $this must be declared static.
$this
static
Warning
Using this rule is risky.
Risky when using ->bindTo on lambdas without referencing to $this.
->bindTo
--- Original +++ New @@ -1,4 +1,4 @@ <?php -$a = function () use ($b) +$a = static function () use ($b) { echo $b; };