Question

Link to code 由于无法除以0，因此我的php将显示错误消息，但是，尽管它显示错误消息，但它还会显示如果不除以0则应显示的表。？

        <!DOCTYPE html>
        <html>
        <head>
        <title>Math Calculations!</title>
        </head>
        <body>
        <!-- Background color selection for site-->
        <body style="background-color:#ACDDE3;">
        <?php

我的价值观

        // input values
        $firstInt = $_POST["firstInt"];
        $secondInt = $_POST["secondInt"];
        $calc = $_POST["calc"];
        $result = 0;
        // inc-math-problems.php
        include ("juarez-inc-calc.php");

声明

        elseif ($calc == "Multiplication") {
        $calculation = "Multiplication";
        $prefix = "The product of";
        $result = prodIntegers($firstInt, $secondInt);
        }
        elseif ($calc == "Divison") {
        $calculation = "Divison";
        $prefix = "The quotient of";

目标

        if ($secondInt == 0){
            print("Error: You can't divide by zero
            $result = "invalid";
        }
        else{
        $result = quotIntegers($firstInt, $secondInt);
        }

打印语句

        print("<style>
        table, th, td {
        border: 1px solid black;
        padding: 5px;
        }
        table {
        border-spacing: 5px;
        }
        </style>
        </head>
        <body>

        <h2>The Results</h2>

        <table>
        <tr>
        <th>Operation</th>
        <th>Result</th> 
        </tr>
        <tr>
        <td>$calculation</td>
        <td>$result</td>
        </tr>
        </table>");

        print("<a href=\"juarez-calculations.html\"> Return to form        </a>");

        ?>

        </body>
        </html>

Answer 1

尝试一下：

if ($secondInt == 0){
    print("Error: You cannot divide by zero");
    $result = "invalid";
}
else{
    $result = quotIntegers($firstInt, $secondInt);
 }

Answer 2

问题出在您的目标块中：-

if ((int)$secondInt === 0){
    print("Error: You can't divide by zero");
    $result = "invalid";
}
else{
    $result = quotIntegers($firstInt, $secondInt);
}
if($result!="invalid"){
//////print your table here
}

如何防止表格出现

2 个答案: