php教程

ReflectionClass::getDocComment

(PHP 5, PHP 7)

ReflectionClass::getDocComment获取文档注释

说明

public ReflectionClass::getDocComment ( void ) : string

从一个类中获取文档注释。

Warning

本函数还未编写文档,仅有参数列表。

参数

此函数没有参数。

返回值

如果存在则返回文档注释,否则返回 FALSE

范例

Example #1 ReflectionClass::getDocComment() 例子

<?php
/** 
* A test class
*
* @param  foo bar
* @return baz
*/
class TestClass { }

$rc = new ReflectionClass('TestClass');
var_dump($rc->getDocComment())
?>

以上例程会输出:

string(55) "/** 
* A test class
*
* @param  foo bar
* @return baz
*/"

参见

User Contributed Notes

bohwaz 15-Feb-2019 10:41
Please note that doc comments are handled differently than regular comments by PHP and the OpCache.

Doc comments are actually kept by the OpCache and accessible by this reflection API, unless disabled by the "opcache.save_comments" INI directive, see http://php.net/manual/en/opcache.configuration.php#ini.opcache.save-comments
i at hyurl dot com 23-Jul-2017 04:35
Not only this method can find a document by a given method name of a class, like this
 <?php
class Foo{
   
/**
     * something describes this method
     */
   
function bar(){
       
/** code here... */
   
}
}
$ref = new ReflectionClass('Foo');
print_r($ref->getMethod('bar')->getDocComment()); //will print out the method document as expected.
?>
But, also, if there is no method document in the defination, and the class extends from some other class, the program will automatically
try to find document from the parent class., like this:
<?php
class Foo2 extends Foo{}

$ref = new ReflectionClass('Foo');
print_r($ref->getMethod('bar')->getDocComment()); //will print out the method document as expected.
?>
geoffreybans at gmail dot com 07-Jan-2016 02:15
This code can help you get the contents of a docBlock in array format beginning with the @symbol and ignoring the (*) asterists.

class Home {

    /**
     *This method loads the homepage
     *@param int $id The user id
     *@throws \Exception If the user id doesn't exist
     *@return void
     */
    public function index( $id)
    {

         #...your code here

      }

}

$object = new Home();

//get the comment string
$comment_string= (new ReflectionClass($object))->getMethod('index')->getdoccomment();

//define the regular expression pattern to use for string matching
$pattern = "#(@[a-zA-Z]+\s*[a-zA-Z0-9, ()_].*)#";

//perform the regular expression on the string provided
preg_match_all($pattern, $comment_string, $matches, PREG_PATTERN_ORDER);

echo "<pre>"; print_r($matches);

//this outputs
Array
(
    [0] => Array
        (
            [0] => @param int $id The user id
            [1] => @throws \Exception If the user id doesn't exist
            [2] => @return void
        )

    [1] => Array
        (
            [0] => @param int $id The user id
            [1] => @throws \Exception If the user id doesn't exist
            [2] => @return void
        )

)

//you can then be able to access the particular string values by index
gabe at fijiwebdesign dot com 23-Aug-2014 11:46
You can also get the docblock definitions for the defined methods of a class as such:

<?php
/**
 * This is an Example class
 */
class Example
{
   
/**
     * This is an example function
     */
   
public function fn()
    {
       
// void
   
}
}

$reflector = new ReflectionClass('Example');

// to get the Class DocBlock
echo $reflector->getDocComment()

// to get the Method DocBlock
$reflector->getMethod('fn')->getDocComment();

?>
sun 28-Jun-2014 02:11
Note that \ReflectionClass::getDocComment() ignores all other PHP code and all white-space between the last encountered T_DOC_COMMENT and the class/element definition.

The only exceptions appear to be T_NAMESPACE declarations and T_FUNCTION definitions.

<?php
/**
 * Before namespace.
 */
namespace Foo;

 
/**
 * After namespace.
   */ 
 
// ^^ contains excessive leading + trailing white-space.
use Bar\Baz;
const
FOO = 'BAR';
$ns = 'bar';
# function foo() {}
$a = 2 + 1;
#/** what? */
// ^^ A single-line T_DOC_COMMENT is invisible when commented out.
count(array());

class
Foo {
}

$reflector = new \ReflectionClass('Foo\Foo');
var_dump($reflector->getDocComment());
?>
yields, despite all the garbage in between:

string(28) "/**
 * After namespace.
   */"

To sum up:

1. If there are multiple doc comments, the last encountered applies.

2. Removing the "After namespace." docblock yields FALSE.
   (The namespace delimits the scope.)

3. Uncommenting the function definition yields FALSE.
   (The doc comment applies to the function instead.)

4. Despite being an own language construct, the "const" constant declaration does not delimit the scope.

5. Any leading and trailing white-space before and after the T_DOC_COMMENT ("/**...*/") is ignored, but the entire string content within (including all white-space) is consumed literally/verbatim.

[PHP 5.4.29]
uramihsayibok, gmail, com 15-Sep-2010 09:50
According to what I can find in the PHP (5.3.2) source code, getDocComment will return the doc comment as the parser found it.
The doc comment (T_DOC_COMMENT) must begin with a /** - that's two asterisks, not one. The comment continues until the first */. A normal multi-line comment /*...*/ (T_COMMENT) does not count as a doc comment.

The doc comment itself includes those five characters, so <?php substr($doccomment, 3, -2) ?> will get you what's inside. A call to trim() after is recommended.
joe dot scylla at gmail dot com 14-Oct-2009 08:23
If you're using a bytecode cache like eAccelerator this method will return FALSE even if there is a properly formatted Docblock. It looks like the information required by this method gets stripped out by the bytecode cache.

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