问题
Because I already use ASP.NET I decided to use PHP on IIS, I install it using Wep PI but when I trying to install Composer he fails with PHP settings error.
I tried to change the extension_dir to absolute and uncommented php_wincache extension in php.ini but none of my solutions works
C:\Program Files (x86)\iis express\PHP\v7.2\php.exe
The php.ini used by your command-line PHP is: C:\Program Files (x86)\iis express\PHP\v7.2\php.ini
A setting in your php.ini could be causing the problem: Either the 'extension_dir' value is incorrect or the dll does not exist.
Program Output: PHP Warning: PHP Startup: Unable to load dynamic library 'php_wincache.dll' (tried: C:\Program Files (x86)\iis express\PHP\v7.2\ext\php_wincache.dll (%1 n’est pas une application Win32 valide.), C:\Program Files (x86)\iis express\PHP\v7.2\ext\php_php_wincache.dll.dll (Le module spécifié est introuvable.)) in Unknown on line 0
回答1:
It's a little late to answer this question. But I also face the same issue and somehow able to resolve it. Please follow below steps to resolve this.
Step 1: Install Windows Cache Extension for PHP.
You can install it from http://php.net/manual/en/wincache.installation.php
Or you can use Web Platform Installer. (Please see the screenshot.)
Step 2: After installation goes to folder "Windows Cache for PHP". Copy php_wincache.dll.
Step 3: Paste copied file into your PHP/ext location. e.g. "C:/Program Files/PHP/v7.0/ext".
Now you can try to install composer again.
I hope this will help you.
回答2:
I've had the same problem and found the answer on PHP Manual.
The wincache version for 7.0 is compiled for php7.dll not the thread safe php7ts.dll. You may need to compile the source for wincache or change to the non thread safe version.
Guess is you have installed the "thread safe" version of PHP, and you don't have php7.dll which WinCache needs.
来源：https://stackoverflow.com/questions/51538107/unable-to-load-dynamic-library-php-wincache-dll