What are some common methods for troubleshooting PHP code that interacts with a database for frontend elements?

Issue: When troubleshooting PHP code that interacts with a database for frontend elements, common methods include checking for syntax errors, ensuring database connections are established correctly, verifying SQL queries are correct, and handling database errors gracefully. 

// Example PHP code snippet for troubleshooting database interactions
<?php
// Establish a database connection
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database_name";

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

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

// Sample SQL query to fetch data from a table
$sql = "SELECT * FROM table_name";
$result = $conn->query($sql);

// Check if query executed successfully
if ($result) {
    // Fetch and display data
    while($row = $result->fetch_assoc()) {
        echo "Column1: " . $row["column1"]. " - Column2: " . $row["column2"]. "<br>";
    }
} else {
    echo "Error: " . $conn->error;
}

// Close database connection
$conn->close();
?>

Keywords

SQL injection PDO error handling debugging database connection

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