What steps can be taken to troubleshoot and debug PHP code for database queries involving file uploads?

Issue: When dealing with database queries involving file uploads in PHP, it is important to ensure that the file upload process is working correctly and that the file data is properly inserted into the database. To troubleshoot and debug any issues, you can start by checking the file upload process, verifying the database connection, and examining the SQL query for errors. PHP Code Snippet: 

<?php
// Check if file was uploaded successfully
if ($_FILES['file']['error'] !== UPLOAD_ERR_OK) {
    die('File upload failed with error code: ' . $_FILES['file']['error']);
}

// Connect to the database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";
$conn = new mysqli($servername, $username, $password, $dbname);

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

// Prepare and execute SQL query to insert file data into database
$fileData = file_get_contents($_FILES['file']['tmp_name']);
$stmt = $conn->prepare("INSERT INTO files (data) VALUES (?)");
$stmt->bind_param("s", $fileData);
$stmt->execute();

// Check for errors in SQL query execution
if ($stmt->error) {
    die("SQL query error: " . $stmt->error);
}

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

Keywords

PHP database queries file uploads debugging troubleshooting

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