In PHP, why should SQL queries like updates be placed before any HTML output?

Placing SQL queries like updates before any HTML output is important because once HTML output has started, headers have already been sent to the browser, and any SQL queries that modify the database after that point may cause errors. To avoid this, ensure that all database operations are completed before any HTML content is sent to the browser. 

<?php
// Place SQL update query before any HTML output
$updateQuery = "UPDATE table_name SET column_name = 'new_value' WHERE condition";
// Execute the update query
// Connect to database and execute the query

// Now, proceed with HTML output
?>
<!DOCTYPE html>
<html>
<head>
    <title>Update Example</title>
</head>
<body>
    <h1>Update Successful!</h1>
</body>
</html>

Keywords

PHP SQL queries updates HTML output execution order

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