What are some common errors to watch out for when retrieving and displaying data, such as images, from a MySQL database using PHP?

One common error when retrieving and displaying images from a MySQL database using PHP is not handling the image data properly. To avoid this issue, make sure to use the appropriate headers to indicate that the response is an image. Additionally, ensure that the image data is properly fetched and displayed on the webpage. 

// Retrieve image data from MySQL database
$query = "SELECT image_data FROM images WHERE id = 1";
$result = mysqli_query($conn, $query);

if ($result) {
    $row = mysqli_fetch_assoc($result);
    
    // Set appropriate headers
    header("Content-type: image/jpeg");
    
    // Display the image
    echo $row['image_data'];
} else {
    echo "Error fetching image data";
}

Keywords

MySQL PHP data retrieval image display error handling

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