file_put_content如果不存在则创建文件？

$html = file_get_contents('http://www.test.com);
$file = '/Applications/MAMP/htdocs/test.html';
file_put_contents($file,$html);

Does file_put_content create the file test.html when file doesn't exists?

yes.

as per php documentation:

If filename does not exist, the file is created.