How can PHP developers troubleshoot common errors such as incorrect file sizes or failed downloads when using header functions for file downloads?

When using header functions for file downloads in PHP, common errors such as incorrect file sizes or failed downloads can be troubleshooted by ensuring that the headers are set correctly. To fix these issues, make sure to set the Content-Length header to the actual size of the file being downloaded and use appropriate headers like Content-Type and Content-Disposition. 

$file = 'example.pdf';
$fileSize = filesize($file);

header('Content-Type: application/pdf');
header("Content-Length: $fileSize");
header('Content-Disposition: attachment; filename="' . basename($file) . '"');

readfile($file);
exit;

Keywords

PHP header functions file sizes download errors troubleshooting

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