The code is taken from thinkphp:
function mk_dir($dir, $mod = 0777)
{
if(!is_dir($dir) || mkdir($dir, $mod))
{
if(!mk_dir(dirname($dir, $mod)))
{
return false;
}
}
return mkdir($dir, $mod);
}
Principle: Just keep trying to create upper-level directories, and so on
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