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电梯直达

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发表于 2004-07-03 00:05 |只看该作者 |倒序浏览

PHP.net发布了新的版本PHP5，称为是一个真正面向对象的版本。有谁用过，请发表高见。
下面是从php.net摘录的介绍：

1。全新的对象模型
2。引入Private 和Protected 成员变量
Example
<?php
class MyClass {
private $Hello = "Hello, World!\n";
protected $Bar = "Hello, Foo!\n";
protected $Foo = "Hello, Bar!\n";
function printHello() {
print "MyClass::printHello() " . $this->;Hello;
print "MyClass::printHello() " . $this->;Bar;
print "MyClass::printHello() " . $this->;Foo;
}
}
class MyClass2 extends MyClass {
protected $Foo;
function printHello() {
MyClass::printHello(); /* Should print */
print "MyClass2::printHello() " . $this->;Hello; /* Shouldn't print out anything */
print "MyClass2::printHello() " . $this->;Bar; /* Shouldn't print (not declared)*/
print "MyClass2::printHello() " . $this->;Foo; /* Should print */
}
}
$obj = new MyClass();
print $obj->;Hello; /* Shouldn't print out anything */
print $obj->;Bar; /* Shouldn't print out anything */
print $obj->;Foo; /* Shouldn't print out anything */
$obj->;printHello(); /* Should print */
$obj = new MyClass2();
print $obj->;Hello; /* Shouldn't print out anything */
print $obj->;Bar; /* Shouldn't print out anything */
print $obj->;Foo; /* Shouldn't print out anything */
$obj->;printHello();
?>;
3。引入Private和 protected 方法
Example
<?php
class Foo {
private function aPrivateMethod() {
echo "Foo::aPrivateMethod() called.\n";
}
protected function aProtectedMethod() {
echo "Foo::aProtectedMethod() called.\n";
$this->;aPrivateMethod();
}
}
class Bar extends Foo {
public function aPublicMethod() {
echo "Bar::aPublicMethod() called.\n";
$this->;aProtectedMethod();
}
}
$o = new Bar;
$o->;aPublicMethod();
?>;
4。引入抽象 Classes 和 Methods
Example
<?php
abstract class AbstractClass {
abstract public function test();
}
class ImplementedClass extends AbstractClass {
public function test() {
echo "ImplementedClass::test() called.\n";
}
}
$o = new ImplementedClass;
$o->;test();
?>;
5。接口（Interfaces）
Example
<?php
interface Throwable {
public function getMessage();
}
class MyException implements Throwable {
public function getMessage() {
// ...
}
}
?>;
6。 Class Type Hints
7。Final 成员和方法
8。Object Cloning
9。Destructors （类似JAVA，对操作错误后内存释放很有用）
Example
<?php
class MyDestructableClass {
function __construct() {
print "In constructor\n";
$this->;name = "MyDestructableClass";
}
function __destruct() {
print "Destroying " . $this->;name . "\n";
}
}
$obj = new MyDestructableClass();
?>;
10。常量定义Constants
<?php
class Foo {
const constant = "constant";
}
echo "Foo::constant = " . Foo::constant . "\n";
?>;
11。抛出例外Exceptions （类似java,错误处理很方便）
Example
<?php
class MyException {
function __construct($exception) {
$this->;exception = $exception;
}
function Display() {
print "MyException: $this->;exception\n";
}
}
class MyExceptionFoo extends MyException {
function __construct($exception) {
$this->;exception = $exception;
}
function Display() {
print "MyException: $this->;exception\n";
}
}
try {
throw new MyExceptionFoo('Hello');
}
catch (MyException $exception) {
$exception->;Display();
}
catch (Exception $exception) {
echo $exception;
}
?>;
Example
<?php
class Exception {
function __construct(string $message=NULL, int code=0) {
if (func_num_args()) {
$this->;message = $message;
}
$this->;code = $code;
$this->;file = __FILE__; // of throw clause
$this->;line = __LINE__; // of throw clause
$this->;trace = debug_backtrace();
$this->;string = StringFormat($this);
}
protected $message = 'Unknown exception'; // exception message
protected $code = 0; // user defined exception code
protected $file; // source filename of exception
protected $line; // source line of exception
private $trace; // backtrace of exception
private $string; // internal only!!
final function getMessage() {
return $this->;message;
}
final function getCode() {
return $this->;code;
}
final function getFile() {
return $this->;file;
}
final function getTrace() {
return $this->;trace;
}
final function getTraceAsString() {
return self::TraceFormat($this);
}
function _toString() {
return $this->;string;
}
static private function StringFormat(Exception $exception) {
// ... a function not available in PHP scripts
// that returns all relevant information as a string
}
static private function TraceFormat(Exception $exception) {
// ... a function not available in PHP scripts
// that returns the backtrace as a string
}
}
?>;
12。允许静态成员变量和静态方法的初始化
Example
<?php
class foo {
static $my_static = 5;
public $my_prop = 'bla';
}
print foo::$my_static;
$obj = new foo;
print $obj->;my_prop;
?>;
Static Methods
Example
<?php
class Foo {
public static function aStaticMethod() {
// ...
}
}
Foo::aStaticMethod();
?>;
13。Instanceof 关键字
Example
<?php
class baseClass { }
$a = new baseClass;
if ($a instanceof baseClass) {
echo "Hello World";
}
?>;
14。Parameters that are passed by reference to a function may now have default values
Example
<?php
function my_function(&$var = null) {
if ($var === null) {
die("$var needs to have a value");
}
}
?>;