PHP反射怎样获取类信息

在PHP中，可以使用ReflectionClass类来获取类的信息。ReflectionClass类提供了许多方法来检查类的属性和方法。以下是一些常用的方法：

1. 获取类名：

$reflectionClass = new ReflectionClass('ClassName');
$className = $reflectionClass->getName();
echo $className; // 输出 "ClassName"

2. 检查类是否存在：

if ($reflectionClass->isClass()) {
    echo "Class exists.";
} else {
    echo "Class does not exist.";
}

3. 获取类文档注释：

$reflectionClass = new ReflectionClass('ClassName');
$documentationComment = $reflectionClass->getDocComment();
echo $documentationComment;

4. 获取类属性：

$reflectionClass = new ReflectionClass('ClassName');
$properties = $reflectionClass->getProperties();

foreach ($properties as $property) {
    echo "Property name: " . $property->getName() . "\n";
    echo "Property type: " . $property->getType() . "\n";
    echo "Property default value: " . $property->getDefaultValue() . "\n";
}

5. 获取类方法：

$reflectionClass = new ReflectionClass('ClassName');
$methods = $reflectionClass->getMethods();

foreach ($methods as $method) {
    echo "Method name: " . $method->getName() . "\n";
    echo "Method visibility: " . ($method->isPublic() ? "public" : ($method->isPrivate() ? "private" : "protected")) . "\n";
    echo "Method return type: " . ($method->hasReturnType() ? $method->getReturnType() : "void") . "\n";
}

6. 创建类的实例：

$reflectionClass = new ReflectionClass('ClassName');
$instance = $reflectionClass->newInstance();

7. 检查类是否是接口、类或 trait：

$reflectionClass = new ReflectionClass('ClassName');

if ($reflectionClass->isInterface()) {
    echo "Class is an interface.";
} elseif ($reflectionClass->isClass()) {
    echo "Class is a class.";
} elseif ($reflectionClass->isTrait()) {
    echo "Class is a trait.";
}

这些方法只是ReflectionClass类提供的一部分功能。你可以根据需要使用这些方法来获取类的详细信息。