php header file transfer corrupted

Question

I have some files in a folder. i use the following php code to transfer the file to browser (with headers).

i download the correct length of file in .7z format but i can't unzip it. if i transfer the same file with ftp, i can unzip it without problem. From my server i can unzip it without problem to. so the error is somewhere in php

    private function pushToBrowser($file){
    if(!$file){ // file does not exist
        die('file not found');
    } else {
        header("Cache-Control: public");
        header("Content-Description: File Transfer");
        header("Content-Disposition: attachment; filename=$file");
        header("Content-Type: application/zip");
        header("Content-Transfer-Encoding: binary");
        header("Content-length: ".filesize($file).";\n");

        // read the file from disk
        readfile($file);
    }
}

an the usage ot the code

$this->pushToBrowser($path);

Answer 1

before you call readfile($path) do a ob_clean(); & flush();

so finally your code should look like:

private function pushToBrowser($file){
    if(!$file){ // file does not exist
        die('file not found');
    } else {
        header("Cache-Control: public");
        header("Content-Description: File Transfer");
        header("Content-Disposition: attachment; filename=$file");
        header("Content-Type: application/x-7z-compressed");
        header("Content-Transfer-Encoding: binary");
        header("Content-length: ".filesize($file).";\n");
        ob_clean();
        flush();
        // read the file from disk
        readfile($file);
    }
}