提取PHP类方法REFLECTION值 - Extract PHP class method REFLECTION values

Extract PHP class method REFLECTION values

本文关键字：REFLECTION 类方法 PHP 提取 | 更新日期: 2023-09-27

我正在用这样的默认参数测试php的反射。。。

class Test{
  public function testMethod($class,$methodName){
     // the returned values
     $data = array();
    // get the method of the class passed by params
    $funcHandler = new ReflectionMethod($class,$methodName);
    // iterates through the parameters to catch de default values
    foreach ($funcHandler->getParameters() as $param){
      // instance the params to get the properties for that method
      $paramDetail = new ReflectionParameter(array($class, $method),$param->name);
      // check if that param is or has a default value attached like (public function method($a,$b,$c = false, $d = null)
      $data[$param->name] = ($paramDetail->isDefaultValueAvailable) ? funcHandler->getDefaultValue : '';
        return $data;
      }
   }
//let's test the reflection with the method params...
class Foo{
    public function method1($a,$b,$c = false, $d = null, $e = 'hello'){
     // instance of the Test Class
     $obj = new Test();
     // calling the test method with this class and method names
     print_r($obj->testMethod(__CLASS__,__FUNCTION__));
    }
}

问题是行"new ReflectionParameter（array（$class，$method），$param->name）；"当执行"$data[$param->name]=（$paramDetail->isDefaultValueAvailable）？"表示没有isDefaultValueAvailable或isOptional。

有什么想法如何从类方法中提取可选参数吗？它似乎与函数配合得很好。

ReflectionParameter类有一个isOption（）方法，它会告诉你参数是否是可选的（只有当它有默认值时，它才是可选的），如果它是可选的，你可以调用getDefaultValue（）来提取默认值。

这是你的代码补丁使用它们：

<?php
class Test {
    public function testMethod($class,$methodName){
        // the returned values
        $data = array();
        // get the method of the class passed by params
        $funcHandler = new ReflectionMethod($class,$methodName);
        // iterates through the parameters to catch de default values
        foreach ($funcHandler->getParameters() as $param){
            // the new ReflectionParameter ... not needed, getParameters() already give you ReflectionParameter instances
            // check if that param (a ReflectionParameter instance) has a default value attached like (public function method($a,$b,$c = false, $d = null)
            $data[$param->name] = ($param->isOptional()) ? $param->getDefaultValue() : '';
        }
        return $data;
    }
}
//let's test the reflection with the method params...
class Foo{
    public function method1($a,$b,$c = false, $d = null, $e = 'hello'){
        // instance of the Test Class
        $obj = new Test();
        // calling the test method with this class and method names
        var_dump($obj->testMethod(__CLASS__,__FUNCTION__));
    }
}
$f = new Foo;
$f->method1('a', 'b');

输出：

array(5) {
  ["a"]=>
  string(0) ""
  ["b"]=>
  string(0) ""
  ["c"]=>
  bool(false)
  ["d"]=>
  NULL
  ["e"]=>
  string(5) "hello"
}

isOptional和isDefaultValueAvailable都是方法而非属性。