php怎么获取方法的注释

php获取方法的注释：首先打开相应的PHP文件；然后通过php中的反射机制，获取该类的文档注释；最后通过获取其所有的方法，获取方法的注释即可。

本文操作环境：windows7系统、PHP7.1版，DELL G3电脑

php反射获取类和方法中的注释

通过php中的反射机制，获取该类的文档注释，再通过获取其所有的方法，获取方法的注释

所用到的主要类及其方法

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ReflectionClass
ReflectionClass::getDocComment
ReflectionClass::getMethods
 
$method->getName()
$method->getDocComment();
$method->isProtected();
$method->getParameters();
 
$param->getName();
$param->isDefaultValueAvailable();
$param->getDefaultValue()

测试类如下：

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test.php

getDocComment ();
//解析类的注释头
$parase_result =  DocParserFactory::getInstance()->parse ( $doc );
$class_metadata = $parase_result;
 
//输出测试
var_dump ( $doc );
echo "\r\n";
print_r( $parase_result );
echo "\r\n-----------------------------------\r\n";
 
//获取类中的方法，设置获取public,protected类型方法
$methods = $reflection->getMethods(ReflectionMethod::IS_PUBLIC + ReflectionMethod::IS_PROTECTED + ReflectionMethod::IS_PRIVATE);
//遍历所有的方法
foreach ($methods as $method) {
    //获取方法的注释
    $doc = $method->getDocComment();
    //解析注释
    $info = DocParserFactory::getInstance()->parse($doc);
    $metadata = $class_metadata +  $info;
    //获取方法的类型
    $method_flag = $method->isProtected();//还可能是public,protected类型的
    //获取方法的参数
    $params = $method->getParameters();
    $position=0;    //记录参数的次序
    foreach ($params as $param){
        $arguments[$param->getName()] = $position;
        //参数是否设置了默认参数，如果设置了，则获取其默认值
        $defaults[$position] = $param->isDefaultValueAvailable() ? $param->getDefaultValue() : NULL;
        $position++;
    }
 
    $call = array(
        'class_name'=>$class_name,
        'method_name'=>$method->getName(),
        'arguments'=>$arguments,
        'defaults'=>$defaults,
        'metadata'=>$metadata,
        'method_flag'=>$method_flag
    );
    print_r($call);
    echo "\r\n-----------------------------------\r\n";
}

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parse ( $php_doc_comment );
}
 
/**
 * Class DocParserFactory 解析doc
 *
 * @example
 *      DocParserFactory::getInstance()->parse($doc);
 */
class DocParserFactory{
 
    private static $p;
    private function DocParserFactory(){
    }
 
    public static function getInstance(){
        if(self::$p == null){
            self::$p = new DocParser ();
        }
        return self::$p;
    }
 
}

TestClass.php

DocParser.php  该类源自一个开源项目

 * @author     R.Arul Kumaran 
 * @copyright  2010 Luracast
 * @license    http://www.gnu.org/licenses/ GNU General Public License
 * @link       https://github.com/murraypicton/Doqumentor
 */
class DocParser {
    private $params = array ();
    function parse($doc = '') {
        if ($doc == '') {
            return $this->params;
        }
        // Get the comment
        if (preg_match ( '#^/\*\*(.*)\*/#s', $doc, $comment ) === false)
            return $this->params;
        $comment = trim ( $comment [1] );
        // Get all the lines and strip the * from the first character
        if (preg_match_all ( '#^\s*\*(.*)#m', $comment, $lines ) === false)
            return $this->params;
        $this->parseLines ( $lines [1] );
        return $this->params;
    }
    private function parseLines($lines) {
        foreach ( $lines as $line ) {
            $parsedLine = $this->parseLine ( $line ); // Parse the line
            
            if ($parsedLine === false && ! isset ( $this->params ['description'] )) {
                if (isset ( $desc )) {
                    // Store the first line in the short description
                    $this->params ['description'] = implode ( PHP_EOL, $desc );
                }
                $desc = array ();
            } elseif ($parsedLine !== false) {
                $desc [] = $parsedLine; // Store the line in the long description
            }
        }
        $desc = implode ( ' ', $desc );
        if (! empty ( $desc ))
            $this->params ['long_description'] = $desc;
    }
    private function parseLine($line) {
        // trim the whitespace from the line
        $line = trim ( $line );
        
        if (empty ( $line ))
            return false; // Empty line
        
        if (strpos ( $line, '@' ) === 0) {
            if (strpos ( $line, ' ' ) > 0) {
                // Get the parameter name
                $param = substr ( $line, 1, strpos ( $line, ' ' ) - 1 );
                $value = substr ( $line, strlen ( $param ) + 2 ); // Get the value
            } else {
                $param = substr ( $line, 1 );
                $value = '';
            }
            // Parse the line and return false if the parameter is valid
            if ($this->setParam ( $param, $value ))
                return false;
        }
        
        return $line;
    }
    private function setParam($param, $value) {
        if ($param == 'param' || $param == 'return')
            $value = $this->formatParamOrReturn ( $value );
        if ($param == 'class')
            list ( $param, $value ) = $this->formatClass ( $value );
        
        if (empty ( $this->params [$param] )) {
            $this->params [$param] = $value;
        } else if ($param == 'param') {
            $arr = array (
                    $this->params [$param],
                    $value 
            );
            $this->params [$param] = $arr;
        } else {
            $this->params [$param] = $value + $this->params [$param];
        }
        return true;
    }
    private function formatClass($value) {
        $r = preg_split ( "[\(|\)]", $value );
        if (is_array ( $r )) {
            $param = $r [0];
            parse_str ( $r [1], $value );
            foreach ( $value as $key => $val ) {
                $val = explode ( ',', $val );
                if (count ( $val ) > 1)
                    $value [$key] = $val;
            }
        } else {
            $param = 'Unknown';
        }
        return array (
                $param,
                $value 
        );
    }
    private function formatParamOrReturn($string) {
        $pos = strpos ( $string, ' ' );
        
        $type = substr ( $string, 0, $pos );
        return '(' . $type . ')' . substr ( $string, $pos + 1 );
    }
}