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