What are common reasons for variables not being written to a database in PHP?

Common reasons for variables not being written to a database in PHP include incorrect SQL queries, missing connection to the database, or errors in the data being passed. To solve this issue, check the SQL query for errors, ensure the database connection is established, and validate the data being inserted. 

// Example code snippet to write variables to a database in PHP

// Establish a connection to the database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// Prepare and execute an SQL query to insert variables into the database
$variable1 = "value1";
$variable2 = "value2";

$sql = "INSERT INTO table_name (column1, column2) VALUES ('$variable1', '$variable2')";

if ($conn->query($sql) === TRUE) {
    echo "Variables written to the database successfully";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

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

Keywords

MySQL database connection SQL injection error handling data validation

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