What steps can be taken to troubleshoot and identify why a specific variable is not being written to a database in PHP?

If a specific variable is not being written to a database in PHP, you can troubleshoot the issue by checking if the variable is properly set and if the database connection is established correctly. Make sure that the variable is being passed to the database query and that there are no errors in the SQL statement. You can also use error handling functions like mysqli_error() to identify any issues with the database query. 

// Assuming $variable contains the value you want to write to the database

// Check if the variable is set
if(isset($variable)){
    // Establish a database connection
    $conn = mysqli_connect("localhost", "username", "password", "database");

    // Check if the connection is successful
    if($conn){
        // Prepare the SQL statement
        $sql = "INSERT INTO table_name (column_name) VALUES ('$variable')";

        // Execute the query
        if(mysqli_query($conn, $sql)){
            echo "Variable successfully written to the database.";
        } else {
            echo "Error: " . mysqli_error($conn);
        }

        // Close the connection
        mysqli_close($conn);
    } else {
        echo "Failed to connect to the database.";
    }
} else {
    echo "Variable is not set.";
}

Keywords

PHP debugging variable database troubleshooting

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