Steps required for PHP database connection, from basic to advanced

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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