PHP在服务器上创建文件以下载

Question

我尝试在Web服务器上创建文件，然后下载。 使用此代码

<?php
$text = "test";
$filename = 'Testfile.txt';
file_put_contents($filename, $text, FILE_APPEND | LOCK_EX) or die ("Unable to open file!");

header("Cache-Control: public");
header("Content-Description: File Transfer");
header("Content-Length: ". filesize("$filename").";");
header("Content-Disposition: attachment; filename=$filename");
header("Content-Type: application/octet-stream; "); 
header("Content-Transfer-Encoding: binary");
readfile($filename);
?>

问题是，我总是得到“无法打开文件！” ..如果我尝试不带或死了.....，它将下载文件，但为空。 我试图在服务器上创建一个具有所有权限的文件夹（chmod 777 ...），但是比在该位置加载/创建文件，但这也行不通。 :(

Answer 1

$text = "test";
$filename = 'Testfile.txt';
if (is_writable($filename)) {
    file_put_contents($filename, $text, FILE_APPEND | LOCK_EX) or die ("Unable to open file!");
} else {
    echo "You Do not have write permission to this FILE.";
}

Answer 2

使用filewrite并检查文件夹是否具有写权限

$text = '123';
$filename = "Testfile.txt";
$fh = fopen($filename, 'w') or die("can't open file");
fwrite($fh, $text);
fclose($fh);


header("Cache-Control: public");
header("Content-Description: File Transfer");
header("Content-Length: ". filesize("$filename").";");
header("Content-Disposition: attachment; filename=$filename");
header("Content-Type: application/octet-stream; "); 
header("Content-Transfer-Encoding: binary");
readfile($filename);