安装/配置
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安装

To be able to use the functions defined in this module you must compile your PHP interpreter using the configure line --with-informix[=DIR] , where DIR is the Informix base install directory, defaults to nothing.

安装/配置
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PHP手册 - N: 安装

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shotsheep at 163 dot com (17-Nov-2009 05:57)

For windows , apache server, php connect informix.       
I have try 4 days and finally success with it.       
My php env is apache 2.0, php 5.2, informix 09.40       
       
1) download php_ifx.dll from php home page （search with pecl-5.2 Win32）, put php_ifx.dll in your php extension dir , in my case c:\php\ext .        
2) in php.ini add follows :        
extension=php_ifx.dll       
3) download informix cdsk 3.0TC for windows from ibm, install it and then run your php app which has informix connect operation, if apache server has a error dialog, then restart computer(because installation add a system variable path : C:\Program Files\IBM\Informix\Client-SDK\bin), after restart confirm this error not occure again. (in this step php page finally error  with "sqlstate = IX 000 sqlcode= -25560" because of informix server not set, we will solute it in next step)
4) run C:\Program Files\IBM\Informix\Client-SDK\bin\setnet32.exe change the values by following       
    4)-1 Tab Server Information   
        IBM Informix Server : informix server name
        HostName : informix  server ip address
        Protocolname : onsoctcp
        ServiceName : informix server port

    4)-2 Host Information   
        Current Host : informix  server ip address
    then click OK    
5) run your php app, then you can do any ifx_xxxxx informix db operation. (in windows apache env don't mind INFORMIXDIR var ect...)