What are the potential reasons for a 404 error when trying to download a file using PHP?

A potential reason for a 404 error when trying to download a file using PHP is that the file path specified in the code is incorrect or the file does not exist on the server. To solve this issue, make sure that the file path is correct and the file exists in the specified location. 

<?php
$file = 'path/to/file.txt';

if (file_exists($file)) {
    header('Content-Description: File Transfer');
    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment; filename=' . basename($file));
    header('Expires: 0');
    header('Cache-Control: must-revalidate');
    header('Pragma: public');
    header('Content-Length: ' . filesize($file));
    readfile($file);
    exit;
} else {
    echo 'File not found.';
}
?>

Keywords

404 error download file PHP file path permissions

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