How can error handling and debugging tools in PHP be utilized to troubleshoot issues with data retrieval and output?

Issue: When retrieving data from a database and outputting it in PHP, errors can occur due to incorrect queries, missing data, or formatting issues. To troubleshoot these issues, error handling techniques such as try-catch blocks and debugging tools like var_dump() can be used to identify and fix the problem. 

// Example code snippet using error handling and debugging tools in PHP

try {
    // Connect to the database
    $conn = new PDO("mysql:host=localhost;dbname=myDB", "username", "password");
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

    // Retrieve data from the database
    $stmt = $conn->prepare("SELECT * FROM myTable");
    $stmt->execute();
    
    // Output the data
    while ($row = $stmt->fetch()) {
        var_dump($row); // Debugging output
        echo $row['column_name'] . "<br>";
    }
} catch (PDOException $e) {
    echo "Error: " . $e->getMessage();
}

Keywords

error handling debugging tools PHP data retrieval output

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