How can debugging techniques be effectively utilized in PHP to troubleshoot issues with file uploads and database insertion?

Issue: When uploading a file and inserting data into a database in PHP, there may be issues with the file upload process or database insertion. To troubleshoot these issues, debugging techniques such as error logging, var_dump(), and die() statements can be effectively utilized to identify the root cause of the problem. PHP Code Snippet: 

<?php
// File upload handling
if ($_FILES['file']['error'] > 0) {
    die('File upload error: ' . $_FILES['file']['error']);
} else {
    move_uploaded_file($_FILES['file']['tmp_name'], 'uploads/' . $_FILES['file']['name']);
}

// Database insertion
$conn = new mysqli('localhost', 'username', 'password', 'database');
if ($conn->connect_error) {
    die('Database connection error: ' . $conn->connect_error);
}

$data = $_POST['data'];
$sql = "INSERT INTO table_name (data) VALUES ('$data')";
if ($conn->query($sql) === TRUE) {
    echo 'Data inserted successfully';
} else {
    echo 'Error inserting data: ' . $conn->error;
}

$conn->close();
?>

Keywords

PHP debugging techniques file uploads database insertion error handling

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