$z=adbqhwbqjuyguqwgyquiwguyquwehqwuiepoqiuwepoqiuwpoiqwepiqwruweroiuyiqazxswedcvfrtgbnhyujmkilopplmkoijnbhuygvcftrdxzsewqa;
$a="abcdefghijklmnopqrstuvwsyz";
for($i=0;$i $s=$a[$i];
$b=0;
for ($j=0;$j if ($a[$i]==$z[$j]){ $b+=1;
}
}
echo $a{$i}."出现的次数:".$b."
";}
?>
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随机大写字母chr(rand(65,90));随机小写字母chr(rand(97,122));可以简化输入那么多的字符