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1.给定一个数组$arr = [23,3,45,6,78,8,34],筛选其偶数成员组成新的数组返回，请封装函数。

<?php
$arr = [23,3,45,6,78,8,34];
function odd(array $arr):array
{
    $newArr=[];
 for($i=0;$i<count($arr);$i++){
    if($arr[$i]%2==0){
        $newArr[]=$arr[$i];
//或者使用array_push($newArr,$arr[$i]);
    }
 }
 return $newArr;
}
var_dump(odd($arr));
?>

运行效果如下

2. 尝试实现简单的计算器功能，语言不限制。

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>计算器</title>
</head>
<body>
    <?php
                    error_reporting(E_ALL &~E_NOTICE);
                    if(isset($_POST['sub'])):
                        if($_POST['opt']=='/'
                        &&$_POST['num2']==0) $mess="
                        <span style='color:red;'>除数不能为0</span>";
                    endif;
                    ?>
    <h1>计算器</h1>
    <table>
        <form action="" method="POST">
            <tr>
                <td>
                    <input type="number" name="num1" required value="<?=$_POST['num1']?>">
                </td>
                <td>
                    <select name="opt">
                        <option value="+" <?=$_POST['opt']=="+"?"selected":"" ?>>+</option>
                        <option value="-" <?=$_POST['opt']=="-"?"selected":"" ?>>-</option>
                        <option value="*" <?=$_POST['opt']=="*"?"selected":"" ?>>*</option>
                        <option value="/" <?=$_POST['opt']=="/"?"selected":"" ?>>/</option>
                    </select>
                </td>
                <td>
                    <input type="number" name="num2" required value="<?=$_POST['num2']?>">
                </td>
                <td>
                    <input type="submit" name="sub" value="计算">
                    <?php
                 if(!$mess && isset($_POST['sub']) ):
                      switch($_POST['opt']):
                         case "+":
                             $sum=(int)$_POST['num1']+(int)$_POST['num2'];break;
                           case "-":
                               $sum=(int)$_POST['num1']-(int)$_POST['num2'];break;
                       case "*":
                             $sum=(int)$_POST['num1']*(int)$_POST['num2'];break;
                       case "/":
                             $sum=(int)$_POST['num1']/(int)$_POST['num2'];break;
                       endswitch;
                       $res="计算结果:{$_POST['num1']}
                       {$_POST['opt']}{$_POST['num2']}={$sum}";
                       echo "<span style='color: green;'>{$res}</span>";
                    else:
                        echo $mess;
                    endif;
        ?>
                </td>
            </tr>
        </form>
    </table>
</body>
</html>

运行效果如下：

Correcting teacher：

天蓬老师

Correction status：qualified

Teacher's comments：

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1.给定一个数组$arr = [23,3,45,6,78,8,34],筛选其偶数成员组成新的数组返回，请封装函数。

2. 尝试实现简单的计算器功能，语言不限制。