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PHPz批改状态：合格
老师批语：
<!doctype html><html lang="en"><head><meta charset="UTF-8"><meta name="viewport"content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0"><meta http-equiv="X-UA-Compatible" content="ie=edge"><title>Document</title></head><body><form method="post"><input type="text" name="first" /><select name="s" id=""><option value="+">+</option><option value="-">-</option><option value="*">*</option><option value="%">%</option><option value="/">/</option></select><input type="text" name="second"><input type="submit" value="结果"></form></body></html><?php//判断是否PHP的得到值$first=$_POST["first"]; //获得name为first的值$v=$_POST["s"]; //获取name为s的值$second=$_POST["second"]; //获取name为second的值if($v=="+"){echo $first."+".$second."结果为".($first+$second);}elseif($v== "-"){echo $first."-".$second."结果为".($first-$second);}elseif($v== "*"){echo $first."*".$second."结果为".($first-$second);}elseif($v=="/"){if($second ==0){echo "除数不能为0";}else{echo $first."/".$second."结果为".($first/$second);}}elseif($v == "%"){if($second ==0){echo "除数不能为0";}else{echo $first."%".$second."结果为".($first%$second);}}function demo(string $name):string{return '你好'.$name;}//demo('灭绝师太');echo call_user_func('demo','灭绝老师');echo call_user_func_array('demo',['朱老师']);//递归函数 函数自身调用自身，但必须在调用自身前有条件判断，否则无限调用下去//声明缓存目录ob_clean();function del($dir){if(is_dir($dir)){//成功打开目录流if($handle = opendir($dir)){while(($file=readdir($handle))!==false){if($file !='.'&& $file !='..'){if(is_dir($dir.'\\'.$file)){delete_dir_file($dir.'\\'.file);}else{unlink($dir.'\\'.$file);}}}}closedir($handle);}}$path = __DIR__;del($path);?>
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