ReflectionClass::isInstantiable

(PHP 5, PHP 7, PHP 8)

ReflectionClass::isInstantiable检查类是否可实例化

说明

public ReflectionClass::isInstantiable(): bool

检查这个类是否可实例化。

参数

此函数没有参数。

返回值

成功时返回 true, 或者在失败时返回 false

示例

示例 #1 ReflectionClass::isInstantiable() 示例

<?php
class C { }

interface
iface {
function
f1();
}

class
ifaceImpl implements iface {
function
f1() {}
}

abstract class
abstractClass {
function
f1() { }
abstract function
f2();
}

class
D extends abstractClass {
function
f2() { }
}

trait
T {
function
f1() {}
}

class
privateConstructor {
private function
__construct() { }
}

$classes = array(
"C",
"iface",
"ifaceImpl",
"abstractClass",
"D",
"T",
"privateConstructor",
);

foreach(
$classes as $class ) {
$reflectionClass = new ReflectionClass($class);
echo
"Is $class instantiable? ";
var_dump($reflectionClass->isInstantiable());
}

?>

以上示例会输出:

Is C instantiable?  bool(true)
Is iface instantiable?  bool(false)
Is ifaceImpl instantiable?  bool(true)
Is abstractClass instantiable?  bool(false)
Is D instantiable?  bool(true)
Is T instantiable?  bool(false)
Is privateConstructor instantiable?  bool(false)

参见