How important is error handling in PHP, especially when using MySQLi?

Error handling in PHP, especially when using MySQLi, is crucial to ensure that any potential issues with database queries or connections are properly addressed. Without proper error handling, it can be difficult to identify and resolve errors, leading to potential security vulnerabilities or data loss. By implementing error handling techniques, such as checking for errors after executing queries and displaying informative error messages, developers can better understand and address any issues that may arise. 

// Connect to MySQL database
$mysqli = new mysqli("localhost", "username", "password", "database");

// Check for connection errors
if ($mysqli->connect_errno) {
    die("Failed to connect to MySQL: " . $mysqli->connect_error);
}

// Perform a query
$result = $mysqli->query("SELECT * FROM users");

// Check for query errors
if (!$result) {
    die("Error executing query: " . $mysqli->error);
}

// Process query results
while ($row = $result->fetch_assoc()) {
    // Do something with the data
}

// Close the connection
$mysqli->close();

Keywords

error handling PHP MySQLi exceptions debugging

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