php5和命名空间？

Question

我在PHP中工作很多，但我从来没有真正理解PHP中的名称空间方法。有人可以帮我吗？我在php.net的网站上看过它没有解释得很好，我找不到它的例子。

我需要知道如何在示例版本中创建代码。

• 名称空间：样品
  • 类：sample_class_1
    • 功能：test_func_1
  • 类：sample_class_2
    • 功能：test_func_2
    • 功能：test_func_3

Answer 1

喜欢这个？

<?php 

namespace sample 
{ 
    class Sample_class_1 
    { 
     public function test_func_1($text) 
     { 
      echo $text; 
     } 
    } 

    class Sample_class_2 
    { 
     public static function test_func_2() 
     { 
      $c = new Sample_class_1(); 
      $c->test_func_1("func 2<br />"); 
     } 

     public static function test_func_3() 
     { 
      $c = new Sample_class_1(); 
      $c->test_func_1("func 3<br />"); 
     } 
    } 
} 

// Now entering the root namespace... 
// (You only need to do this if you've already used a different 
// namespace in the same file) 
namespace 
{ 
    // Directly addressing a class 
    $c = new sample\Sample_class_1(); 
    $c->test_func_1("Hello world<br />"); 

    // Directly addressing a class's static methods 
    sample\Sample_class_2::test_func_2(); 

    // Importing a class into the current namespace 
    use sample\Sample_class_2; 
    sample\Sample_class_2::test_func_3(); 
} 

// Now entering yet another namespace 
namespace sample2 
{ 
    // Directly addressing a class 
    $c = new sample\Sample_class_1(); 
    $c->test_func_1("Hello world<br />"); 

    // Directly addressing a class's static methods 
    sample\Sample_class_2::test_func_2(); 

    // Importing a class into the current namespace 
    use sample\Sample_class_2; 
    sample\Sample_class_2::test_func_3(); 
} 

如果您在另一个文件是你不需要调用namespace {进入根命名空间。所以，想象下面的代码是另一个文件“ns2.php”，而原来的代码是“ns1.php”：

// Include the other file 
include("ns1.php"); 

// No "namespace" directive was used, so we're in the root namespace. 

// Directly addressing a class 
$c = new sample\Sample_class_1(); 
$c->test_func_1("Hello world<br />"); 

// Directly addressing a class's static methods 
sample\Sample_class_2::test_func_2(); 

// Importing a class into the current namespace 
use sample\Sample_class_2; 
sample\Sample_class_2::test_func_3();