How can header settings in PHP affect the display of images retrieved from a database?

When retrieving images from a database in PHP, setting the correct headers is crucial for displaying the images correctly in the browser. Without proper headers, the browser may not recognize the content type of the image and display it incorrectly or not at all. To solve this issue, you can use the header() function in PHP to set the appropriate content type header before outputting the image data.

// Retrieve image data from the database
$imageData = // fetch image data from the database

// Set the appropriate content type header
header('Content-Type: image/jpeg');

// Output the image data
echo $imageData;