testing how good is_callable is about method accessibility.

gistfile1.php

<?php

class BobTest {

	public function PublicMethod() { return; }
	protected function ProtectedMethod() { return; }
	private function PrivateMethod() { return; }

	public function TestCallables() {
		echo "testing myself...", PHP_EOL;
		foreach((new ReflectionClass(__CLASS__))->getMethods() as $m) {
			if(is_callable([$this,$m->name]))
			echo "->{$m->name} yep", PHP_EOL;

			else
			echo "->{$m->name} nope", PHP_EOL;
		}
	}

}

$test = new BobTest;
$test->TestCallables();

echo "testing publicly...", PHP_EOL;
foreach((new ReflectionClass($test))->getMethods() as $m) {
	if(is_callable([$test,$m->name]))
	echo "->{$m->name} yep", PHP_EOL;

	else
	echo "->{$m->name} nope", PHP_EOL;
}