求助：编译第三方库为DLL适配PHP5.6.31的技术问题

Alright, let's tackle compiling lpsolve as a PHP 5.6.31 DLL step by step—since you've already got the core build tools and sources set up, let's dive into the critical parts that often trip folks up.

1. Prepare lpsolve Source & Integration Files #

• First, grab the lpsolve source package (stable releases like 5.5 or 5.5.2.5 work best for PHP 5.6's VC11 toolchain).
• Extract it to your PHP build directory—ideally place it under php-5.6.31-src/ext/ so PHP's build system can detect it automatically.
• Copy the lpsolve PHP integration files (from the "Using lpsolve in PHP" docs you referenced) into this new ext/lpsolve folder: this includes php_lpsolve.h, lpsolve.c, and config.w32.

2. Configure the PHP Build Environment #

• Open the VS2012 Native Tools Command Prompt (PHP 5.6 relies on VC11, so newer VS versions won't work here). Navigate to your PHP SDK build root.
• Run the SDK environment setup script first to initialize the build context:

  phpsdk_setvars.bat
  

• Move into the php-5.6.31-src directory and run the configure command to enable the lpsolve extension. Make sure to point to your lpsolve source path correctly:

  configure --enable-cli --enable-lpsolve=shared --with-lpsolve=<path-to-lpsolve-source>/lpsolve55
  

  Note: Replace <path-to-lpsolve-source> with the actual full or relative path to your extracted lpsolve folder (e.g., ../lpsolve55 if it's placed alongside the PHP source directory).

3. Build the DLL #

• If the configure step completes without errors, start the build process with:

  nmake
  

• Once the build finishes successfully, your compiled php_lpsolve.dll will be located in either the Release_TS or Debug_TS subfolder (TS stands for Thread Safe, which is the standard build type for PHP on Windows).

Common Pitfalls & Quick Fixes #

• VC11 Compatibility Errors: If you run into C++ syntax or linker errors, double-check you're using the VS2012 toolchain exclusively—PHP 5.6 doesn't support newer Visual Studio versions. Also, ensure lpsolve's source files are configured to compile with C++ in the build context if needed.
• Missing lpsolve Library: If the linker complains about lpsolve55.lib not being found, you'll need to build lpsolve itself first using the same VC11 toolchain. Compile the lpsolve static library first, then point the PHP configure command to the folder containing this compiled .lib file.
• Thread Safety Mismatch: PHP 5.6's pre-built dependencies are Thread Safe by default, so don't disable ZTS (Zend Thread Safety) in your configure command unless you're intentionally building a non-thread-safe version.
• Post-Build Setup: After compiling, copy php_lpsolve.dll to your PHP installation's ext folder. Add extension=php_lpsolve.dll to your php.ini file, then restart your web server or PHP CLI to load the extension.

If you hit specific error messages during any of these steps, paste the exact output here—I can help narrow down the issue quickly.

内容的提问来源于stack exchange，提问作者Art Eby