What are some best practices for handling database queries and image retrieval in PHP to prevent header-related errors?

When handling database queries and image retrieval in PHP, it is important to ensure that header-related errors, such as "Headers already sent" errors, are prevented by not outputting any content before setting headers. To achieve this, you can use output buffering to capture the output before headers are sent. 

<?php
ob_start(); // Start output buffering

// Database query
// Your database query code here

// Image retrieval
// Your image retrieval code here

ob_end_flush(); // Flush the output buffer
?>

Keywords

SQL injection PDO prepared statements imagecreatefromstring Content-Type.

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