srand((double)microtime()*1000000);
$sourcechars='0123456789abcdefghijklmnopqrstuvwxyzQWERTYUIOPLKJHGFDSAZXCVBNM';
$sourcecharslength=strlen($sourcechars)-1;
$randomword='';
$randomwordlength=7;
for($i=0;$i<$randomwordlength;++$i)
{$randomword.=$sourcechars[rand(0,$sourcecharslength)];
}