Assuming you installed Uniform Server Installed.
1. Navigate to \core\php54\extensions and verify php_ldap.dll is there. 2. Open \core\php54\php_development.ini or php_production.ini depending on which one you are using. 3. Find ";extension=php_ldap.dll" and remove the semi-colon so it should read "extension=php_ldap.dll" 4. Save and Close. 5. Stop and Restart Apache 6. View your php_info() to make sure the ldap section is there