What are some common pitfalls when using multiple database queries in PHP?

One common pitfall when using multiple database queries in PHP is not properly closing the database connection after executing the queries. This can lead to resource leaks and potential performance issues. To solve this, always remember to close the database connection after executing all queries. 

// Open a connection to the database
$connection = mysqli_connect("localhost", "username", "password", "database");

// Execute multiple queries
$query1 = mysqli_query($connection, "SELECT * FROM table1");
$query2 = mysqli_query($connection, "SELECT * FROM table2");

// Process the results

// Close the database connection
mysqli_close($connection);

Keywords

SQL injection database connection mysqli prepared statements error handling

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