PHPの関数ライブラリとオブジェクトの詳細な説明

class_exists ( string $class_name [, bool $autoload = true ] ) : bool
interface_exists ( string $interface_name [, bool $autoload = true ] ) : bool
trait_exists ( string $traitname [, bool $autoload = true ] ) : bool

function common_class_exists(string $class): bool
{
    return class_exists($class, false) || interface_exists($class, false) || trait_exists($class, false);
}

method_exists ( mixed $object , string $method_name ) : bool
property_exists ( mixed $class , string $property ) : bool

trait RedirectsUsers
{
    public function redirectPath()
    {
        if (method_exists($this, 'redirectTo')) {
            return $this->redirectTo();
        }
        return property_exists($this, 'redirectTo') ? $this->redirectTo : '/home';
    }
}

is_a ( object $object , string $class_name [, bool $allow_string = FALSE ] ) : bool
is_subclass_of ( object $object , string $class_name ) : bool

interface A {}
interface B {}
class BaseFoo implements B {}
class Foo extends BaseFoo implements A{}
$foo = new Foo();
// 对象
is_a($foo, 'BaseFoo'); // true
is_a($foo, 'Foo'); // true
is_a($foo, 'A'); // true
// 类
is_a('Foo', 'BaseFoo'); // false
is_a('Foo', 'BaseFoo', true);  // true, 传入第三个参数，代表允许使用类名而不是示例
is_subclass_of($foo, 'Foo'); // false
is_subclass_of($foo, 'BaseFoo'); // true
is_subclass_of($foo, 'B'); // true

$foo instanceof Foo; // true
$foo instanceof A; // true
$foo instanceof B; // true

class_alias() - 为一个类创建别名
class_alias ( string $original , string $alias [, bool $autoload = TRUE ] ) : bool

class AliasLoader
{
    private $aliases;
    public function __construct(array $aliases)
    {
        $this->aliases = $aliases;
    }
    public function load($alias)
    {
        if (isset($this->aliases[$alias]))
        {
            return class_alias($this->aliases[$alias], $alias);
        }
    }
}
class LongLongLongLongFoo {}
$aliases = [
    'Foo' => 'LongLongLongLongFoo',
    'Bar' => 'LongLongLongLongBar',
];
$loader =  new AliasLoader($aliases);
$loader->load('Foo');
$foo = new Foo();
var_dump($foo);  // object(LongLongLongLongFoo)#3395

foreach (get_declared_classes() as $class) {
    $r = new \ReflectionClass($class);
}

get_called_class ( void ) : array
get_class ([ object $object = NULL ] ) : string
get_parent_class ([ mixed $obj ] ) : string

throw (new ModelNotFoundException)->setModel(get_called_class());

class Foo {
    public function getFullNameAttribute()
    {
    }
    public function getTextAttribute()
    {
    }
    public static function getMutatorMethods()
    {
        preg_match_all(&#39;/(?<=^|;)get([^;]+?)Attribute(;|$)/&#39;, implode(&#39;;&#39;, get_class_methods(static::class)), $matches);
        return $matches[1];
    }
}
Foo::getMutatorMethods()
// [
//     "FullName",
//     "Text",
// ]