搞完了PHP4调用JavaBean，又想去试试调用COM，开始以为很难，自己用VB6写了一个Active Dll在PHP4中调用，马上成功，比调用javabean方便多了，下面讲一下我的步骤。
一：用VB6写Activex Dll
代码如下：
Option Explicit
Private MyScriptingContext As ScriptingContext
Private MyApplication As Application
Private MyRequest As Request Private MyResponse As Response
Private MyServer As Server
Private MySession As Session Public
Sub OnStartPage(PassedScriptingContext As ScriptingContext)
Set MyScriptingContext = PassedScriptingContext
Set MyApplication = MyScriptingContext.Application
Set MyRequest = MyScriptingContext.Request
Set MyResponse = MyScriptingContext.Response
Set MyServer = MyScriptingContext.Server
Set MySession = MyScriptingContext.Session
End Sub
Public Sub OnEndPage()
Set MyScriptingContext = Nothing
Set MyApplication = Nothing
Set MyRequest = Nothing
Set MyResponse = Nothing
Set MyServer = Nothing
Set MySession = Nothing
End Sub
Public Function Test_Number(num) As Variant
If num < 0 Then Get_Number_Attrib = -1
If num > 0 Then Get_Number_Attrib = 1
If num = 0 Then Get_Number_Attrib = 0
End Function
具体方法如下：新建一个VB6工程，ActiveX Dll将工程命名为P_test,类名为c_test
类的文件内容如上。
编译生成p_test.dll文件
二：注册
提示符下运行：regsvr32 p_test.dll
三：编写php文件，test.php4代码如下：
<?
$b=new COM("p_test.c_test");
$a=$b->Test_Number(-454);
echo $a;
?>
运行php4文件将显示-1
可能遇到的问题是，编译工程时通不过，要将
Microsoft Active Server Pages Object Library
引用进来，具体实现“Project->References”找到改库，并勾上
相比之下，PHP4调用com应该比PHP4调用javabean好哦，因为毕竟是Ms系统嘛。大家也可以去自己编写调用数据库的控件，用PHP4调用，从某种程度上，和PHP调用javabean一样，可以说，实现了“隐藏源代码”。