Why is it important to place SQL queries under header information but above readfile in PHP scripts for downloading files?

Placing SQL queries under header information but above readfile in PHP scripts for downloading files is important because headers must be set before any output is sent to the browser. If readfile is called before setting headers, it may cause conflicts and errors. By following this order, you ensure that the headers are correctly set before the file is downloaded, preventing any issues with the download process. 

<?php
// Set headers
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename="example.txt"');

// Execute SQL query
// $sql = "SELECT * FROM files WHERE id = 1";
// $result = mysqli_query($conn, $sql);

// Read and output file
// readfile("path/to/file.txt");
?>

Keywords

SQL queries header information readfile PHP scripts downloading files

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