PHP requires seven steps to connect to the MySQL database: establishing a connection (msiql_connect()) preparing the query (mysqli_prepare()) binding parameters (mysqli_stmt_bind_param()) executing the query (mysqli_stmt_execute()) getting the results (mysqli_stmt_get_result()) traversing the results ( mysqli_fetch_assoc()) close the connection (mysqli_close())
Steps required for PHP database connection, from basic to advanced
1. Basic connection
Use the mysqli_connect() function to establish a connection with the MySQL database:
$mysqli = mysqli_connect("localhost", "username", "password", "database"); if (!$mysqli) { echo "Unable to connect to the database: " . mysqli_connect_error(); exit(); }
2. Prepare query
Use the mysqli_prepare() function to prepare a query:
$stmt = $mysqli->prepare("SELECT * FROM users WHERE id = ?");
3. Bind parameters
Use the mysqli_stmt_bind_param() function to bind parameters in the query:
$param = 3; mysqli_stmt_bind_param($stmt, "i", $param);
4. Execute the query
Use the mysqli_stmt_execute() function to execute the query:
mysqli_stmt_execute($stmt);
5. Get the results
Use the mysqli_stmt_get_result() function to get the query results:
$result = mysqli_stmt_get_result($stmt);
6. Traverse the results
Use the mysqli_fetch_assoc() function to traverse the query results:
while ($row = mysqli_fetch_assoc($result)) { echo "ID: " . $row['id'] . "<br>"; echo "Name: " . $row['name'] . "<br>"; }
7. Close the connection
Use the mysqli_close() function to close the connection with the database:
mysqli_close($mysqli);
Practical case
Connect to the database and query for user
$mysqli = mysqli_connect("localhost", "username", "password", "database"); if (!$mysqli) { echo "Unable to connect to the database: " . mysqli_connect_error(); exit(); } $stmt = $mysqli->prepare("SELECT * FROM users WHERE id = ?"); mysqli_stmt_bind_param($stmt, "i", $param); mysqli_stmt_execute($stmt); $result = mysqli_stmt_get_result($stmt); while ($row = mysqli_fetch_assoc($result)) { echo "ID: " . $row['id'] . "<br>"; echo "Name: " . $row['name'] . "<br>"; } mysqli_close($mysqli);
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