Windows Server 2012 R2中PHP7.x版本报500.0内部服务器错误求助

Hey there, let's break down this issue you're facing. That error code 0xc0000135 is the critical clue here—it means the system can't locate a required dynamic link library (DLL) to run the PHP 7.x FastCGI process. Since PHP 5.3 works perfectly, the root cause is almost always missing or incompatible Visual C++ Redistributable packages (PHP 7.x relies on newer runtime libraries than the older PHP 5.3).

Here's a step-by-step solution to get your PHP 7.2/7.3/7.4 up and running smoothly:

1. Match PHP Version to the Correct VC++ Redistributable #

PHP 7.2, 7.3, and 7.4 all require the Visual C++ Redistributable for Visual Studio 2019 (x86). Even though your server is 64-bit, since your PHP installation is 32-bit (notice the (x86) in the path), you must install the 32-bit version of the redistributable.

2. Clean Up Old VC++ Installs (Optional but Recommended) #

Conflicting older VC++ versions can sometimes cause unexpected issues:

• Open Control Panel > Programs and Features
• Uninstall all entries labeled "Microsoft Visual C++ Redistributable" (all versions)
• Restart your server before moving to the next step

3. Install the Required VC++ Package #

Download and install the x86 version of the Visual C++ 2019 Redistributable. Once installed, restart your server to ensure the libraries are properly registered system-wide.

4. Validate PHP's Ability to Run Independently #

Before checking IIS, confirm PHP itself can execute without errors:

• Open Command Prompt as Administrator
• Run this command:

  "C:\Program Files (x86)\PHP\v7.4\php-cgi.exe" -v
  

• If this throws an error about a missing DLL (like vcruntime140.dll), it confirms the VC++ redistributable wasn't installed correctly. Reinstall the package and try again.

5. Tweak IIS FastCGI and App Pool Settings #

• Open IIS Manager, navigate to FastCGI Settings
• Locate the entry for php-7.4.13 and verify the executable path points correctly to C:\Program Files (x86)\PHP\v7.4\php-cgi.exe
• Go to your website's application pool, set .NET CLR Version to No Managed Code (PHP doesn't rely on .NET runtime)
• Ensure the application pool identity (default is IIS AppPool\DefaultAppPool) has Read & Execute permissions on the C:\Program Files (x86)\PHP\v7.4 directory, and Read permissions on C:\inetpub\wwwroot

6. Verify php.ini Configuration #

Open C:\Program Files (x86)\PHP\v7.4\php.ini and confirm these core settings are correct:

fastcgi.impersonate = 1
cgi.fix_pathinfo = 0
extension_dir = "ext"

You can also temporarily comment out non-critical extensions to rule out missing DLLs from extensions causing the crash.

Quick Note on Why PHP 5.3 Works #

PHP 5.3 uses the older VC9 (Visual Studio 2008) redistributable, which is likely already pre-installed or was added to your Windows Server 2012 R2 system at some point. PHP 7.x moved to newer VC++ versions that aren't included by default.

内容的提问来源于stack exchange，提问作者Florim Salihu