PHP 读取文件与 file_get_contents
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PHP readfile vs. file_get_contents
提问by justnajm
I have used following code to generate zip
我使用以下代码生成zip
// push to download the zip
header('Content-type: application/zip');
header('Content-Disposition: attachment; filename="'.$zip_name.'"');
readfile($zip_name);
this code works fine but for unknown reasons was not working until I tried
此代码工作正常，但由于未知原因在我尝试之前无法正常工作
// push to download the zip
header('Content-type: application/zip');
header('Content-Disposition: attachment; filename="'.$zip_name.'"');
echo file_get_contents($zip_name);
I am curious about finding what is happening in both the cases
我很好奇在这两种情况下都发生了什么
回答by Jesper Blaase
Readfile will read the file directly into the output buffer, and file_get_contents will load the file into memory, when you echo the result the data is copied from memory to the output buffer effectively using 2 times the memory of readfile.
Readfile 会将文件直接读入输出缓冲区，file_get_contents 会将文件加载到内存中，当您回显结果时，数据将从内存复制到输出缓冲区，有效地使用了 readfile 的 2 倍内存。
