PHP中的关联数组和布尔检查

Question

我不太确定如何调用关联数组来验证数字是真还是假，因为我正在为注册类做一个简单的检查器。最大类容量为 40，文件结合 HTML 和 PHP。

我是这样做的：-

<?php   
     //Create the association array.
     $classInfo = array("J1" => 20 ,"J2" => 30,"J3" => 10,"J4" => 43,
                          "J5" => 40,"J6" => 45,"J7" => 15,"J8" => 34,"J9" => 10,"J10" => 45);

     $class = array_keys($classInfo);
     $totalEnroll = count($classInfo);
?>

守则：-

    <table width="300" style="border: 1px solid black">
        <tr>
            <?php
                // class and enroll Lists
                echo "<td width=20>";  
                echo "Class"."&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp"." Enroll"."<br><hr>";
                    for($i=0; $i < $totalEnroll; ++$i) { 
                        echo $class[$i] . "&nbsp&nbsp&nbsp&nbsp&nbsp" . 
                             $classInfo[$class[$i]] . "<br>"; 
                    } 
                echo "</td>";
                
                // Enroll to check whether the classroom is full.
                echo "<td width=20>";
                    echo "Class States" . "<br><hr>";
                    for($check = 0; $check < 10; $check++){
                        if($classInfo[$totalEnroll[$check]] >= 0 && 
                           $classInfo[$totalEnroll[$check]] <= 40){
                            echo "Full";
                            echo " <br>";
                        } else {
                            echo "Not Full";
                            echo " <br>";
                        }
                    }
                echo "</td>";
            ?>
        </tr>
    </table>

我想要的输出：-

Class	Enroll	Full States
J1	20	Not Full
J5	40	Full

请检查部分说`//注册以检查教室是否已满。这是检查注册类代码的地方。

不过，顺便说一下，输出可以在类似表格的列中更清晰地对齐。

Answer 1

您在两个单独的循环中显示数据，这使得数据难以对齐，您应该将其设置为 1 个循环，并在每组项目周围使用 <tr> 和 <td> 标签...

<table width="300" style="border: 1px solid black">
    <?php
        foreach ( $classInfo as $className => $enrolled )   {
            echo "<tr>";
            // class and enroll Lists
            echo "<td>{$className}</td>";
            echo "<td>{$enrolled}</td>";

            // Enroll to check whether the classroom is full.
            echo "<td>";
            if($enrolled <= 40){
                echo "Full";
            } else {
                echo "Not Full";
            }
            echo "</td>";
            echo "</tr>";
        }
    ?>
</table>

（这不包括标题，但我相信你可以添加它）。