如何获取方法的默认变量定义 - How to get default variable definitions for a method

How to get default variable definitions for a method

使用PHP的ReflectionClass。这可能吗？

我想得到一个方法和定义变量的列表，如果可能的话，还有它们的默认值。

$reflection = new 'ReflectionClass($var);
$methods = $reflection->getMethods('ReflectionMethod::IS_PUBLIC);
print_r($methods); // only method names here :(

使用ReflectionParameter::getDefaultValue()方法。使用您的代码示例：

$reflection = new 'ReflectionClass($var);
$methods = $reflection->getMethods('ReflectionMethod::IS_PUBLIC);
$methodParameters = array();
foreach ($methods as $method) {
    $parameters = $method->getParameters();
    foreach ($parameters as $parameter) {
        $name = $method->getName() . '::' . $parameter->getName();
        $methodParameters[$name] = null;
        if ($parameter->isOptional()) {
            $methodParameters[$name] = $parameter->getDefaultValue();
        }
    }
}

一个例子：

class a {
        public function methodOne() {
        }
        public function methodTwo($param) {     
        }
        public function methodThree($param = 'foo') {
        }
}
    $var = new a();
    $reflection = new 'ReflectionClass($var);
    $methods = $reflection->getMethods('ReflectionMethod::IS_PUBLIC);
    $methodParameters = array();
    foreach ($methods as $method) {
        $parameters = $method->getParameters();
        foreach ($parameters as $parameter) {
            $name = $method->getName() . '::' . $parameter->getName();
            $methodParameters[$name] = null;
            if ($parameter->isOptional()) {
                $methodParameters[$name] = $parameter->getDefaultValue();
            }
        }
    }
    var_dump($methodParameters);
// results in this array:
array(2) {
  ["methodTwo::param"]=>
  NULL
  ["methodThree::param"]=>
  string(3) "foo"
}