Check if a class implements all methods of an interface

hhvm_compatible.php

<?php

# Created for https://github.com/facebook/hhvm/issues/5170

require 'vendor/autoload.php';

$i = new ReflectionClass('League\OAuth2\Client\Provider\ProviderInterface');
$c = new ReflectionClass('League\OAuth2\Client\Provider\AbstractProvider');

$r = [];
$h = [];

foreach ($i->getMethods(ReflectionMethod::IS_PUBLIC) as $method) {
    $r[] = $method->getName();
}

foreach ($c->getMethods(ReflectionMethod::IS_PUBLIC) as $method) {
    if ($method->getDeclaringClass() == $c) {
        $h[] = $method->getName();
    }
}

$missing = array_diff($r, $h);

if (empty($missing)) {
    printf("OKAY: %s implements all methods of %s\n",
        $c->getName(),
        $i->getName()
    );
} else {
    printf("ERROR: %s is missing some methods of %s:\n- %s\n",
        $c->getName(),
        $i->getName(),
        implode("\n- ", $missing)
    );
}