What are some potential reasons for files being defective when downloaded using PHP scripts?

Files may be defective when downloaded using PHP scripts due to issues with the file handling process, such as incorrect permissions, incomplete file downloads, or encoding errors. To solve this issue, ensure that the file permissions are set correctly, use appropriate file handling functions, and check for any encoding issues that may affect the downloaded file. 

// Example PHP code snippet to download a file with proper error handling

$file = 'example.pdf';

if (file_exists($file)) {
    header('Content-Description: File Transfer');
    header('Content-Type: application/pdf');
    header('Content-Disposition: attachment; filename="'.basename($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

file corruption PHP script download errors server configuration MIME type

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