function yzImgNumRand($lenth){
 mt_srand((double)microtime() * 1000000);
$Str[0] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
 $Str[1] = "abcdefghijklmnopqrstuvwxyz";
 $Str[2] = "01234567891234567890123456";
for($i=0;$i<$lenth;$i++){
  $randval.= $Str[rand(0,2)][rand(0,25)];
}
 return $randval;
} 
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