Is Switching from MySQL to MySQLi as Simple as Replacing `mysql_query` with `mysqli_query`?

Converting MySQL to mysqli

In this article, we'll tackle the transition from MySQL to mysqli and how to convert existing code to utilize the mysqli extension.

Is it as Simple as Changing mysql_query($sql); to mysqli_query($sql);?

While that's a crucial step, it's not the only one. To effectively convert to mysqli, you'll need to replace all instances of mysql_ functions with their mysqli_ equivalents. The MySQLi Extension Function Summary provides a comprehensive guide for this conversion.

Replacing Specific MySQL Functions

• mysql_connect → mysqli_connect
• mysql_error → mysqli_error or mysqli_connect_error (depending on context)
• mysql_query → mysqli_query

Note: While most function parameters remain similar, some may have slight variations. For example:

• mysql requires mysql_select_db to specify the database for queries, while mysqli allows you to provide the database name as the fourth argument to mysqli_connect.
• mysqli also offers mysqli_select_db, which you can use if desired.

Example Conversion

Consider the following code using the MySQL API:

$link = mysql_connect($DB['host'], $DB['user'], $DB['pass']) or die(...);
mysql_select_db($DB['dbName']);

The equivalent mysqli code would be:

$link = mysqli_connect($DB['host'], $DB['user'], $DB['pass'], $DB['dbName']) or die(...);

Final Steps

Once the conversions are complete, test the script to ensure it functions correctly. If not, it's time for some debugging.

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