如何在 php 中下载文件

Question

I want to download image file in php.

<?php
if(isset($_REQUEST["file"])){

    $filepath = BASE_URL.'assets/uploads/save_template_images/template1_221594899972.png';

    // Process download
    if(file_exists($filepath)) {
        echo $filepath;
        exit;
        header('Content-Description: File Transfer');
        header('Content-Type: application/octet-stream');
        header('Content-Disposition: attachment; filename="'.basename($filepath).'"');
        header('Expires: 0');
        header('Cache-Control: must-revalidate');
        header('Pragma: public');
        header('Content-Length: ' . filesize($filepath));
        flush(); // Flush system output buffer
        readfile($filepath);
        die();
    } else {
        echo $filepath;
        exit;
        http_response_code(404);
        die();
    }
} 

?>

In my index page, I have an anchor tag and if click on anchor tag then above code run. I am not showing anchor tag because, I put the $filepath static value in above code. When I run above code then it goes on else condition. I think, full path of project is not taking by above code. If I put image in same folder then it downloads.

Answer 1

First ensure allow_url_fopen setting in php.ini file is turned on. After that Use this code to download your file:

<?php
    $url = 'https://lokeshdhakar.com/projects/lightbox2/images/image-5.jpg';
    $file = './files/'.basename($url);
    file_put_contents($file, file_get_contents($url));
?>

For successful download, files directory must be exists. But I think it would be inefficient to add directory existence check as I think you already know where to save the file you are downloading.