Can I Simply Swap `mysql_` Functions with `mysqli_` Functions in PHP?

Can I Directly Replace mysql_ Functions with mysqli_ Functions?

With the deprecation of mysql_ in PHP 5.5 and its removal in PHP 7, you may wonder if you can simply swap mysql_ functions with mysqli_ ones in your projects. Unfortunately, this is not a straightforward replacement.

Key Differences and Considerations:

• While the function names are similar, they are not functionally equivalent.
• mysqli_ requires an explicit connection as an argument, while mysql_ functions do not.
• mysqli_ follows object-oriented methodology, whereas mysql_ is procedural.
• mysqli_ offers enhanced security features, such as prepared statements, for protection against SQL injection.

To facilitate the transition, you can utilize a conversion tool like the MySQLConverterTool (https://github.com/philip/MySQLConverterTool) to automate most of the replacements. However, some manual adjustments may still be necessary.

Basic Replacement Guidelines:

1. Connection:
   Create a new mysqli connection and save it as a variable, e.g., $mysqli. Use this variable for all database operations.
2. Query:
   Include the connection as the first argument in the mysqli_query() function, both in procedural and object-oriented code.
3. Fetch Result:
   In procedural code, use mysqli_fetch_assoc() to retrieve rows. In object-oriented code, use $result->fetch_assoc().
4. Close Connection:
   Close the connection using mysqli_close() in procedural code or $mysqli->close() in object-oriented code.

While these guidelines cover the basics, additional adjustments may be required depending on the specific functions you are using. Refer to the MySQLi documentation for comprehensive information.

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