php面向对象反射API实例详解

反射API

fullshop.php

<?php
class ShopProduct {
  private $title;
  private $producerMainName;
  private $producerFirstName;
  protected $price;
  private $discount = 0;
  public function construct(  $title, $firstName,
              $mainName, $price ) {
    $this->title       = $title;
    $this->producerFirstName = $firstName;
    $this->producerMainName = $mainName;
    $this->price       = $price;
  }
  public function getProducerFirstName() {
    return $this->producerFirstName;
  }
  public function getProducerMainName() {
    return $this->producerMainName;
  }
  public function setDiscount( $num ) {
    $this->discount=$num;
  }
  public function getDiscount() {
    return $this->discount;
  }
  public function getTitle() {
    return $this->title;
  }
  public function getPrice() {
    return ($this->price - $this->discount);
  }
  public function getProducer() {
    return "{$this->producerFirstName}".
        " {$this->producerMainName}";
  }
  public function getSummaryLine() {
    $base = "{$this->title} ( {$this->producerMainName}, ";
    $base .= "{$this->producerFirstName} )";
    return $base;
  }
}
class CdProduct extends ShopProduct {
  private $playLength = 0;
  public function construct(  $title, $firstName,
              $mainName, $price, $playLength=78 ) {
    parent::construct(  $title, $firstName,
                $mainName, $price );
    $this->playLength = $playLength;
  }
  public function getPlayLength() {
    return $this->playLength;
  }
  public function getSummaryLine() {
    $base = parent::getSummaryLine();
    $base .= ": playing time - {$this->playLength}";
    return $base;
  }
}
class BookProduct extends ShopProduct {
  private $numPages = 0;
  public function construct(  $title, $firstName,
              $mainName, $price, $numPages ) {
    parent::construct(  $title, $firstName,
                $mainName, $price );
    $this->numPages = $numPages;
  }
  public function getNumberOfPages() {
    return $this->numPages;
  }
  public function getSummaryLine() {
    $base = parent::getSummaryLine();
    $base .= ": page count - {$this->numPages}";
    return $base;
  }
  public function getPrice() {
    return $this->price;
  }
}
/*
$product1 = new CdProduct("cd1", "bob", "bobbleson", 4, 50 );
print $product1->getSummaryLine()."\n";
$product2 = new BookProduct("book1", "harry", "harrelson", 4, 30 );
print $product2->getSummaryLine()."\n";
*/
?>
<?php
require_once "fullshop.php";
$prod_class = new ReflectionClass( &#39;CdProduct&#39; );
Reflection::export( $prod_class );
?>

output:

Class [ <user> class CdProduct extends ShopProduct ] {
 @@ D:\xampp\htdocs\popp-code\5\fullshop.php 53-73
 - Constants [0] {
 }
 - Static properties [0] {
 }
 - Static methods [0] {
 }
 - Properties [2] {
  Property [ <default> private $playLength ]
  Property [ <default> protected $price ]
 }
 - Methods [10] {
  Method [ <user, overwrites ShopProduct, ctor> public method construct ] {
   @@ D:\xampp\htdocs\popp-code\5\fullshop.php 56 - 61
   - Parameters [5] {
    Parameter #0 [ <required> $title ]
    Parameter #1 [ <required> $firstName ]
    Parameter #2 [ <required> $mainName ]
    Parameter #3 [ <required> $price ]
    Parameter #4 [ <optional> $playLength = 78 ]
   }
  }
  Method [ <user> public method getPlayLength ] {
   @@ D:\xampp\htdocs\popp-code\5\fullshop.php 63 - 65
  }
  Method [ <user, overwrites ShopProduct, prototype ShopProduct> public method getSummaryLine ] {
   @@ D:\xampp\htdocs\popp-code\5\fullshop.php 67 - 71
  }
  Method [ <user, inherits ShopProduct> public method getProducerFirstName ] {
   @@ D:\xampp\htdocs\popp-code\5\fullshop.php 17 - 19
  }
  Method [ <user, inherits ShopProduct> public method getProducerMainName ] {
   @@ D:\xampp\htdocs\popp-code\5\fullshop.php 21 - 23
  }
  Method [ <user, inherits ShopProduct> public method setDiscount ] {
   @@ D:\xampp\htdocs\popp-code\5\fullshop.php 25 - 27
   - Parameters [1] {
    Parameter #0 [ <required> $num ]
   }
  }
  Method [ <user, inherits ShopProduct> public method getDiscount ] {
   @@ D:\xampp\htdocs\popp-code\5\fullshop.php 29 - 31
  }
  Method [ <user, inherits ShopProduct> public method getTitle ] {
   @@ D:\xampp\htdocs\popp-code\5\fullshop.php 33 - 35
  }
  Method [ <user, inherits ShopProduct> public method getPrice ] {
   @@ D:\xampp\htdocs\popp-code\5\fullshop.php 37 - 39
  }
  Method [ <user, inherits ShopProduct> public method getProducer ] {
   @@ D:\xampp\htdocs\popp-code\5\fullshop.php 41 - 44
  }
 }
}

点评：把类看的透彻的一塌糊涂，比var_dump强多了。哪些属性，继承了什么类。类中的方法哪些是自己的，哪些是重写的，哪些是继承的，一目了然。

查看类数据

<?php
require_once("fullshop.php");
function classData( ReflectionClass $class ) {
 $details = "";
 $name = $class->getName();
 if ( $class->isUserDefined() ) {
  $details .= "$name is user defined\n";
 }
 if ( $class->isInternal() ) {
  $details .= "$name is built-in\n";
 }
 if ( $class->isInterface() ) {
  $details .= "$name is interface\n";
 }
 if ( $class->isAbstract() ) {
  $details .= "$name is an abstract class\n";
 }
 if ( $class->isFinal() ) {
  $details .= "$name is a final class\n";
 }
 if ( $class->isInstantiable() ) {
  $details .= "$name can be instantiated\n";
 } else {
  $details .= "$name can not be instantiated\n";
 }
 return $details;
}
$prod_class = new ReflectionClass( &#39;CdProduct&#39; );
print classData( $prod_class );
?>

output:

CdProduct is user defined
CdProduct can be instantiated

查看方法数据

<?php
require_once "fullshop.php";
$prod_class = new ReflectionClass( &#39;CdProduct&#39; );
$methods = $prod_class->getMethods();
foreach ( $methods as $method ) {
 print methodData( $method );
 print "\n----\n";
}
function methodData( ReflectionMethod $method ) {
 $details = "";
 $name = $method->getName();
 if ( $method->isUserDefined() ) {
  $details .= "$name is user defined\n";
 }
 if ( $method->isInternal() ) {
  $details .= "$name is built-in\n";
 }
 if ( $method->isAbstract() ) {
  $details .= "$name is abstract\n";
 }
 if ( $method->isPublic() ) {
  $details .= "$name is public\n";
 }
 if ( $method->isProtected() ) {
  $details .= "$name is protected\n";
 }
 if ( $method->isPrivate() ) {
  $details .= "$name is private\n";
 }
 if ( $method->isStatic() ) {
  $details .= "$name is static\n";
 }
 if ( $method->isFinal() ) {
  $details .= "$name is final\n";
 }
 if ( $method->isConstructor() ) {
  $details .= "$name is the constructor\n";
 }
 if ( $method->returnsReference() ) {
  $details .= "$name returns a reference (as opposed to a value)\n";
 }
 return $details;
}
?>

output:

construct is user defined
construct is public
construct is the constructor
----
getPlayLength is user defined
getPlayLength is public
----
getSummaryLine is user defined
getSummaryLine is public
----
getProducerFirstName is user defined
getProducerFirstName is public
----
getProducerMainName is user defined
getProducerMainName is public
----
setDiscount is user defined
setDiscount is public
----
getDiscount is user defined
getDiscount is public
----
getTitle is user defined
getTitle is public
----
getPrice is user defined
getPrice is public
----
getProducer is user defined
getProducer is public

获取构造函数参数情况

<?php
require_once "fullshop.php";
$prod_class = new ReflectionClass( &#39;CdProduct&#39; );
$method = $prod_class->getMethod( "construct" );
$params = $method->getParameters();
foreach ( $params as $param ) {
  print argData( $param )."\n";
}
function argData( ReflectionParameter $arg ) {
 $details = "";
 $declaringclass = $arg->getDeclaringClass();
 $name = $arg->getName();
 $class = $arg->getClass();
 $position = $arg->getPosition();
 $details .= "\$$name has position $position\n";
 if ( ! empty( $class ) ) {
  $classname = $class->getName();
  $details .= "\$$name must be a $classname object\n";
 }
 if ( $arg->isPassedByReference() ) {
  $details .= "\$$name is passed by reference\n";
 }
 if ( $arg->isDefaultValueAvailable() ) {
  $def = $arg->getDefaultValue();
  $details .= "\$$name has default: $def\n";
 }
 if ( $arg->allowsNull() ) {
  $details .= "\$$name can be null\n";
 }
 return $details;
}
?>

output:

$title has position 0
$title can be null
$firstName has position 1
$firstName can be null
$mainName has position 2
$mainName can be null
$price has position 3
$price can be null
$playLength has position 4
$playLength has default: 78
$playLength can be null

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