How to implement if in php to determine whether a folder exists

php method to implement if to determine whether a folder exists: first create a PHP sample file; then determine whether the folder exists through the "if (!mkdirs(dirname($dir), $mode))" method, If it does not exist, just create it.

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The operating environment of this tutorial: Windows 7 system, PHP version 5.6, This method works for all brands of computers.

php determines whether the folder exists, and creates it if it does not exist

function mkdirs($dir, $mode = 0777)
{
    if (is_dir($dir) || @mkdir($dir, $mode)) return TRUE;
    if (!mkdirs(dirname($dir), $mode)) return FALSE;
    return @mkdir($dir, $mode);
}

mkdirs("aa01");

The default mode is 0777, which means the maximum possibility access rights. For more information about mode please read the chmod() page.

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