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function logMe($str){
    $myLogFile =  $_SERVER['DOCUMENT_ROOT'] . '/' . 'debug_'.rand(1, 99999).".txt";
    $myLogStr .= $str . "\n";
    $fh = fopen($myLogFile, 'a') or die("can't open file");
    fwrite($fh, $myLogStr);
    fclose($fh);   
    }
logMe("Hello World")