Why am I getting the 'Call to Undefined Function sqlsrv_connect()' Error in PHP?

Resolving the Fatal Error "Call to Undefined Function sqlsrv_connect()": A Comprehensive Guide

When attempting to establish a connection to SQL in a PHP script, it is common to encounter the fatal error "Call to Undefined Function sqlsrv_connect()." To rectify this issue, it is essential to delve into the underlying cause and implement the appropriate solutions.

First and foremost, verify that the PHP.INI file, which contains the configuration settings for PHP, has been correctly updated to include the sqlsrv extension. Be mindful of using the correct path to your PHP.INI file, as indicated by phpinfo(). For third-party extensions like sqlsrv, ensure that all compilation parameters align with your PHP version, architecture, compiler, and thread safety.

If the issue persists after restarting Apache, consider checking the Apache logs or utilizing the command line to debug startup errors. Execute the following command to display comprehensive error messages:

php -d display_startup_errors=1 -d error_reporting=-1 -d display_errors -c "C:\Path\To\php.ini" -m

Alternatively, inspect phpinfo() to ascertain if the sqlsrv extension is visible under the PHP Modules section. If the extension is missing, ensure that the extension=php_sqlsrv_54_ts.dll line has been correctly added to the PHP.INI file in the WAMP server bin folder.

Furthermore, ensure that you are using the appropriate database server. The WAMP server primarily runs the MySQL service, whereas you are attempting to connect to SQL Server 2008 R2. Consider using MySQL instead of SQL in this scenario.

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