function writeTo($path,$str){
$dirName = dirname($path);
$mode = 0777;
file_exists($path) || is_dir($path) || @mkdir( dirname($path), $mode, true) || @shell_exec("echo '' > ".$path);
$fp = fopen($path, "a");
$num = fwrite($fp, $str);
fclose($fp);
return $num;
}
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