«php_curl.dll - The operating system cannot run %1»

Copy the following files:

  • libssh2.dll from the PHP installation folder to the C:\Windows\System32 folder
  • php_curl.dll from the ext subdirectory of the PHP installation folder to the C:\Windows\System32 folder
  • libeay32.dll from the PHP installation folder to the Apache installation bin subfolder
  • libssh2.dll from the PHP installation folder to the Apache installation bin subfolder

Then restart Apache.

It also solves the problem:

PHP Startup: Unable to load dynamic library php_curl.dll - The specified procedure could not be found.