php - ReflectionClass getDocComment 返回 false

Question

我正在尝试从一个类中获取文档评论，对于我的一生，我不知道为什么 getDocComment() 返回 false。我期待 getDocComment 返回@Whatever。

<?php
/** @Whatever */
class Test {
}

$rc = new ReflectionClass("Test");
var_dump($rc->getDocComment());

输出: bool (假)

$ php --version
PHP 5.5.1 (cli) (built: Aug 31 2013 01:32:53) 
Copyright (c) 1997-2013 The PHP Group
Zend Engine v2.5.0, Copyright (c) 1998-2013 Zend Technologies
with Zend OPcache v7.0.2-dev, Copyright (c) 1999-2013, by Zend Technologies

Answer 1

如果您使用的是 Zend Opcache，请查看以下 ini设置:

opcache.save_comments (default "1")
    If disabled, all PHPDoc comments are dropped from the code to reduce the
       size of the optimized code. Disabling "Doc Comments" may break some
       existing applications and frameworks (e.g. Doctrine, ZF2, PHPUnit)

opcache.load_comments (default "1")
    If disabled, PHPDoc comments are not loaded from SHM, so "Doc Comments"
       may be always stored (save_comments=1), but not loaded by applications
       that don't need them anyway.