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php自动加载类 设置包含目录 随便new也不出错

Jun 13, 2016 am 10:56 AM
getincludenewpathphpErrorloadIncludeofTable of contentskindautomaticObtainset upmatch

get_include_path — 获取当前的 include_path 配置选项

string get_include_path ( void )


set_include_path — 设置 include_path 配置选项
string set_include_path ( string $new_include_path )


     首先set_include_path这个函数呢,是在脚本里动态地对PHP.ini中include_path进行修改的。
而这个include_path呢,它可以针对下面的include和require的路径范围进行限定,或者说是预定义一下。
  就好像:
       如果我们没有设置这个值,可能我们需要写一些完全的路径:


[php]
   include("123/test1.php"); 
   include("123/test2.php"); 
   include("123/test3.php"); 
   require("123/test4.php"); 
   require("123/test5.php"); 
?> 

                 include("123/test1.php");
          include("123/test2.php");
          include("123/test3.php");
          require("123/test4.php");
          require("123/test5.php");
       ?>

      来引入很多外部文件,但是如果我们设置了set_include_path("123/"),我们就可以用下面这段代码代替。
[php]
   set_include_path("123/"); 
   include("test1.php"); 
   include("test2.php"); 
   include("test3.php"); 
   require("test4.php"); 
   require("test5.php"); 
?> 

                 set_include_path("123/");
          include("test1.php");
          include("test2.php");
          include("test3.php");
          require("test4.php");
          require("test5.php");
       ?>    那么这个函数它不仅可以定义一个文件夹,我们可以定义很多文件夹。如下所示,我要写一个初始化函数:
[php]
  function initialize() 
 
set_include_path(get_include_path().PATH_SEPARATOR . "core/"); 
set_include_path(get_include_path().PATH_SEPARATOR . "app/"); 
set_include_path(get_include_path().PATH_SEPARATOR . "admin/"); 
set_include_path(get_include_path().PATH_SEPARATOR . "lib/"); 
set_include_path(get_include_path().PATH_SEPARATOR . "include/"); 
set_include_path(get_include_path().PATH_SEPARATOR."data/"); 
set_include_path(get_include_path().PATH_SEPARATOR."cache/"); 

       function initialize()
{
    set_include_path(get_include_path().PATH_SEPARATOR . "core/");
    set_include_path(get_include_path().PATH_SEPARATOR . "app/");
    set_include_path(get_include_path().PATH_SEPARATOR . "admin/");
    set_include_path(get_include_path().PATH_SEPARATOR . "lib/");
    set_include_path(get_include_path().PATH_SEPARATOR . "include/");
    set_include_path(get_include_path().PATH_SEPARATOR."data/");
    set_include_path(get_include_path().PATH_SEPARATOR."cache/");
}    这样它的路径就成了:

    .;C:\php5\pear;core/;app/;admin/;lib/;include/;data/;cache/

 


下面呢来一个实例.

[php]
$include_path=get_include_path();                         //原基目录  
$include_path.=PATH_SEPARATOR."include/" ; 
$include_path.=PATH_SEPARATOR."classs/"; 
$include_path.=PATH_SEPARATOR."libs/"; 
//echo $include_path;  
//设置include包含文件所在的所有目录   
set_include_path($include_path); 
 
function __autoload($className) 

//echo '类 '.$className;  
include strtolower($className).".class.php"; 

$Smarty = new Smarty; 
?> 

$include_path=get_include_path();                         //原基目录
$include_path.=PATH_SEPARATOR."include/" ;
$include_path.=PATH_SEPARATOR."classs/";
$include_path.=PATH_SEPARATOR."libs/";
//echo $include_path;
//设置include包含文件所在的所有目录
set_include_path($include_path);

function __autoload($className)
{
//echo '类 '.$className;
include strtolower($className).".class.php";
}
$Smarty = new Smarty;
?>


当指定了多个目录为 include_path ,而所要求包含的文件在这几个目录都有相同名称的文件存在时,php选择使用设定 include_path 时排位居前的目录下的文件。

这样就可以 直接new拉!!

 

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