ReflectionClass::__construct

(PHP 5, PHP 7, PHP 8)

ReflectionClass::__construct初始化 ReflectionClass 类

说明

public ReflectionClass::__construct ( mixed $argument )

初始化新的 ReflectionClass 对象。

参数

argument

既可以是包含类名的字符串(string)也可以是对象(object)。

返回值

返回初始化完成后的 ReflectionClass 实例。

错误/异常

如果要反射的 Class 不存在,抛出异常 ReflectionException

范例

Example #1 ReflectionClass 的基本用法

<?php
Reflection
::export(new ReflectionClass('Exception'));
?>

以上例程的输出类似于:

Class [ <internal:Core> class Exception ] {

  - Constants [0] {
  }

  - Static properties [0] {
  }

  - Static methods [0] {
  }

  - Properties [7] {
    Property [ <default> protected $message ]
    Property [ <default> private $string ]
    Property [ <default> protected $code ]
    Property [ <default> protected $file ]
    Property [ <default> protected $line ]
    Property [ <default> private $trace ]
    Property [ <default> private $previous ]
  }

  - Methods [10] {
    Method [ <internal:Core> final private method __clone ] {
    }

    Method [ <internal:Core, ctor> public method __construct ] {

      - Parameters [3] {
        Parameter #0 [ <optional> $message ]
        Parameter #1 [ <optional> $code ]
        Parameter #2 [ <optional> $previous ]
      }
    }

    Method [ <internal:Core> final public method getMessage ] {
    }

    Method [ <internal:Core> final public method getCode ] {
    }

    Method [ <internal:Core> final public method getFile ] {
    }

    Method [ <internal:Core> final public method getLine ] {
    }

    Method [ <internal:Core> final public method getTrace ] {
    }

    Method [ <internal:Core> final public method getPrevious ] {
    }

    Method [ <internal:Core> final public method getTraceAsString ] {
    }

    Method [ <internal:Core> public method __toString ] {
    }
  }
}

参见

User Contributed Notes

danbettles at yahoo dot co dot uk 22-May-2015 06:47
To reflect on a namespaced class in PHP 5.3, you must always specify the fully qualified name of the class - even if you've aliased the containing namespace using a "use" statement.

So instead of:

<?php
use App\Core as Core;
$oReflectionClass = new ReflectionClass('Core\Singleton');
?>

You would type:

<?php
use App\Core as Core;
$oReflectionClass = new ReflectionClass('App\Core\Singleton');
?>
nulled 18-Dec-2013 03:42
if (is_file($classfile))
            require_once $classfile;

if (! class_exists($classname, false))
            exit('ERROR: ' . $classname . ' is not defined as a Class');

The above code is useful to tell if the class was defined.  You could also use another commentors method using Try Catch Exceptions.  But, if you do not use try blocks much, the above function based method works just fine.

From there, you can than call:

$class = new ReflectionClass($classname);

        if (! $class->isSubclassOf('PanelCommon'))
            exit("ERROR: {$classname} must extends PanelCommon");

        if (! $class->isUserDefined())
            exit("ERROR: {$classname} must be user defined and not internal to PHP");

        if (! $class->IsInstantiable())
            exit("ERROR: {$classname} must be IsInstantiable and not an Interface or Abstract class");

        if (! $class->hasMethod('home'))
            exit("ERROR: {$classname} lacks required method/function home()");

Forforth and so on.
me [at] klay [dot] me 28-Oct-2013 11:09
Example of usage:

    public static function getClassData($class)
    {
        // Trying to create a new object of ReflectionClass class
        $class = new ReflectionClass($class);

        $details = sprintf('%s - %s%s%s%s%s%s%s%s',
            $class->getName(),
            $class->isInternal()     ? 'internal class,' : 'user-defined class,',
            $class->isTrait()        ? '  is trait,'  : '',
            $class->isInterface()    ? '  is interface,'  : '',
            $class->isAbstract()     ? '  is abstract,'  : '',
            $class->isFinal()        ? '  is final,'  : '',
            $class->isCloneable()    ? '  is cloneable,'  : '',
            $class->isInstantiable() ? ' is instantiable,'  : '',
            $class->isIterateable()  ? ' is iterable  : ''
        );

        return '<pre class="debug">' . rtrim($details, ',') . '</pre>';
    }
gafisher at griasolutions dot com 30-Jan-2012 01:23
Running the following code on Windows Vista (I know, I know), PHP 5.3.9, the ReflectionClass constructor actually throws a ReflectionException when the desired class cannot be instantiated:

<?php
   
try {
       
$ReflectedClass = new ReflectionClass('NonExist');
    } catch (
LogicException $Exception) {
        die(
'Not gonna make it in here...');
    } catch (
ReflectionException $Exception) {
        die(
'Your class does not exist!');
    }
?>
cspray at gmail dot com 12-Jun-2011 07:14
Useful to know that if you pass a string into the construct and the class cannot be instantiated for some reason a SPL LogicException will be thrown.

This code was ran on a Mac OS X 10.6.7, AMP, PHP 5.3+

<?php

   
//  index.php
   
try {
       
$ReflectedClass = new ReflectionClass('NonExist');
    } catch (
LogicException $logicDuh) {
       
print_r($logicDuh);
    }
   
?>

Will return a deeply nested array full of useful information about the error.
ivo at jansch dot nl 24-Jan-2010 04:16
It's very useful to know that you can also use the ReflectionClass to inspect interfaces, even thouth Interfaces are not classes. Example:

<?php

 
interface Edible
 
{
    public function
eat();
  }

 
$refl = new ReflectionClass("Edible");
 
$methods = $refl->getMethods();
?>

[Edit by danbrown AT php DOT net - Contains a bugfix by (dbl AT bnet DOT com) on 18-AUG-2010 with the following message: "underline had to be removed for it to work ( new Reflection_Class -> new ReflectionClass )"]