What are the differences in syntax and behavior between the old MySQL functions and MySQLi functions in PHP?

The main differences between the old MySQL functions and MySQLi functions in PHP are that MySQL functions are deprecated and should not be used in new projects, while MySQLi functions are the improved version that offer better security and performance. Additionally, MySQLi functions support prepared statements and transactions, making them more secure for database interactions. 

// Old MySQL functions (deprecated)
$conn = mysql_connect('localhost', 'username', 'password');
mysql_select_db('database_name', $conn);
$result = mysql_query('SELECT * FROM table_name');

// MySQLi functions (recommended)
$conn = mysqli_connect('localhost', 'username', 'password', 'database_name');
$result = mysqli_query($conn, 'SELECT * FROM table_name');

Keywords

MySQL functions MySQLi functions syntax behavior PHP.

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