PHP Test Directory writable

/**
* To test the writable nature of the directory
*
* @param string $dir
* @return int 1 writable 0 not writable
* Source DZ
* Xiao Jia (www.phpcina.cn) organized in 2006-06-26
*/
function Dir_writeable ($dir) {
/**
* $dir if not the directory will create a readable and writable directory
*/
if (!is_dir ($dir)) {
@mkdir ($dir, 0777);
}
if (Is_dir ($dir)) {//If the directory already exists
if ($fp = @fopen ("$dir/test.test", ' W ')) {//Create a file named Test.test to test
@fclose ($FP); Close file stream
@unlink ("$dir/test.test"); Delete test files
$writeable = 1; Can be created then the description can be read, the return value is 1
} else {
$writeable = 0; Cannot create, the return value is 0
}
}
return $writeable; return value
}