What are the potential pitfalls of using PHP extensions like "mssql.so" in a PHP4 environment?

Using PHP extensions like "mssql.so" in a PHP4 environment can lead to compatibility issues and potential security vulnerabilities since PHP4 is no longer supported and may not be compatible with newer extensions. To solve this issue, it is recommended to upgrade to a newer version of PHP (PHP5 or higher) that supports the necessary extensions. 

// Example code snippet to check PHP version and handle mssql extension
if (version_compare(PHP_VERSION, '5.0.0', '<')) {
    die('PHP version 5 or higher is required for mssql extension.');
}

// Use mssql extension in PHP5 or higher environment
// Your mssql extension code here

Keywords

PHP4 mssql.so extensions compatibility deprecated

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