<?php class Foo { public static function bar(string $label): void { echo "Callable called: $label\n"; } } class MyClass { private static string $myCallable; public function myFunc(): void { static::$myCallable = \Foo::class . '::bar'; (self::$myCallable)('this also works'); } } $myCallable = \Foo::class . '::bar'; $myCallable('calling this works!'); (new MyClass)->myFunc();
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