Question

我正在努力让我的PHP单元转换器工作。

我正试图让多个转换器继续运行，但似乎无法使其正常工作。

如果有人能告诉我出错的地方并帮助我顺利完成，那就太棒了。：）

<?php
 if($_POST){
    $fahrenheit = $_POST['fahrenheit'];
    $celsius = ($fahrenheit - 32)*5/9;
 }

 if($_POST){
    $celsius = $_POST['celcius'];
    $fahrenheit = ($celcius - 32)*5/9;
 }
 ?>


        <form action="" method="post">
        Fahrenheit: <input type="text" name="fahrenheit" /><br />
        <?php
        if(isset($celsius)){
            echo "Celsius = ".$celsius;
        }
        ?>
       </form>

<?php
    function fahrenheit_to_celsius($given_value)
    {
        $celsius=5/9*($given_value-32);
        return $celsius ;
    }

    function celsius_to_fahrenheit($given_value)
    {
        $fahrenheit=$given_value*9/5+32;
        return $fahrenheit ;
    }

    function inches_to_centimeter($given_value)
    {
      $centimeter=$given_value/2.54;
      return $centimeter ;
    }

    function centimeter_to_inches($given_value)
    {
      $inches=$given_value*2.54
    }
?>

<html>
    <head>
        <title>Temp. Conv.</title>
    </head>
    <body>
        <form action="" method="post">
        <table>
<!-- FAHRENHEIGHT & CELCIUS V -->
            <tr>
                <td>
                    <select name="first_temp_type_name">
                        <option value="fahrenheit">Fahrenheit</option>
                        <option value="celsius">Celsius</option>
                    </select>
                </td>
            </tr>
            <tr>
                <td>
                    <input type="text" name="given_value">
                </td>
            </tr>
            <tr>
                <td>
                    <select name="second_temp_type_name">
                        <option value="fahrenheit">Fahrenheit</option>
                        <option value="celsius">Celsius</option>
                    </select>
                </td>
            </tr>
            <tr>
                <td>
                    <input type="submit" name="btn" value="Convert">
                </td>
            </tr>

<!--FAHRENHEIGHT & CELCIUS ^ -->

<!-- CENTEMETERS & INCHES -->

            <tr>
                <td>
                    <select name="first_length_type_name">
                        <option value="centimeter">centimeter</option>
                        <option value="inches">Inches</option>
                    </select>
                </td>
            </tr>
            <tr>
                <td>
                    <input type="text" name="given_value">
                </td>
            </tr>

            <tr>
                <td>
                    <select name="second_length_type_name">
                      <option value="centimeter">centimeter</option>
                      <option value="inches">Inches</option>
                    </select>
                </td>
            </tr>
            <tr>
                <td>
                    <input type="text" name="given_value">
                </td>
            </tr>

<!--CENTEMETERS & INCHES ^-->

            <tr>
                <td>
                    <?php
                    if(isset($_POST['btn']))
                    {
                        $first_temp_type_name=$_POST['first_temp_type_name'];
                        $second_temp_type_name=$_POST['second_temp_type_name'];
                        $given_value=$_POST['given_value'];
                        if($first_temp_type_name=='fahrenheit')
                        {
                            $celsious=fahrenheit_to_celsius($given_value);
                            echo "Fahrenheit $given_value = $celsious Celsious";
                        }
                        if($first_temp_type_name=='celsius')
                        {
                            $fahrenheit=celsius_to_fahrenheit($given_value);
                            echo "Celsious  $given_value = $fahrenheit Fahrenheit";
                        }


                    }

                    if(isset($_POST['btn']))
                    {
                        $first_length_type_name=$_POST['first_length_type_name'];
                        $second_length_type_name=$_POST['second_length_type_name'];
                        $given_value=$_POST['given_value'];
                        if($first_length_type_name=='centimeter')
                        {
                            $centimeter=centimeter_to_inches($given_value);
                            echo "Centimeter $given_value = $inches Inches";
                        }
                        if($first_length_type_name=='inches')
                        {
                            $centimeter=inches_to_centimeter($given_value);
                            echo "Inches  $given_value = $centimeter centimeter";
                        }


                    }

                    ?>
                </td>
            </tr>
        </table>
        </form>
    </body>
</html>

我知道有很多事情要发生，道歉。

非常感谢任何帮助：）

Answer 1

您好请使用以下代码。

<?php

ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);

$convertedTemperature    = 0;

/* The condition is entered when the request is of POST type. */
if($_SERVER['REQUEST_METHOD'] == 'POST'){
   $temperature            = $_POST['temperature'];
   $fromConvertionUnit     = $_POST['fromConvertionUnit'];
   $toConvertionUnit       = $_POST['toConvertionUnit'];

/* if the temperature conversion are of same unit then no need for conversion */

   if($fromConvertionUnit == $toConvertionUnit){
       $convertedTemperature = $temperature;
   }else if($fromConvertionUnit == 'fahrenheit' && $toConvertionUnit == 'celcius') {

/* formula to convert Fahrenheit to Celcius */
       $convertedTemperature = ($temperature - 32) * 0.5556;
   }else if($fromConvertionUnit == 'celcius' && $toConvertionUnit == 'fahrenheit') {

/* formula to convert Celcius to Fahrenheit */
       $convertedTemperature = ($temperature * 1.8) + 32;
   }
}
?>
<!doctype html>
<html lang="en">
   <head>
       <meta charset="UTF-8">
       <title>Temperature Converter</title>
   </head>
   <body>
       <form action="<?php echo $_SERVER['PHP_SELF'] ?>" method="post">
           <div>
<!-- If the temperature value has be submitted and has data then it will prefilled -->
               <label for="temperature">Temperature</label> <br/>
               <input type="number" name="temperature" id="temperature" value="<?php echo (!empty($temperature)) ? $temperature : '' ?>">
           </div>
           <div>
               <label for="fromConvertionUnit">Select From Convertion Unit</label><br/>
               <select name="fromConvertionUnit" id="fromConvertionUnit">
                   <option value="fahrenheit">Fahrenheit</option>
                   <option value="celcius">Celcius</option>
               </select>
       </div>
       <div>
               <label for="toConvertionUnit">Select To Convertion Unit</label><br/>
               <select name="toConvertionUnit" id="toConvertionUnit">
                   <option value="fahrenheit">Fahrenheit</option>
                   <option value="celcius">Celcius</option>
               </select>
       </div>
<!-- Once the page is submitted and conversion is done the respective values will be added in the following section -->
           <div>
       Converted Temperature <b> <?php  echo (!empty($temperature)) ? $temperature : '--' ?></b> Value From   <b><?php echo  (!empty($fromConvertionUnit)) ? $fromConvertionUnit : '--' ?></b> TO  <b><?php echo  (!empty($toConvertionUnit)) ? $toConvertionUnit : '--' ?></b> is <b><?php echo  (!empty($convertedTemperature)) ? $convertedTemperature : '--' ?><b/>
               <label for="converted_value">Converted Value</label><br/>
<input type="number" value="<?php echo (!empty($convertedTemperature)) ? $convertedTemperature : '0' ?>">
           </div>
           <div>
<input type="submit" value="Convert">
           </div>
       </form>
   </body>
</html>

Answer 2

如果您想制作转换器，您只需要一个输入 - 以及您希望转换为的输入。然后在提交表单时在PHP中使用switch来检查您希望使用的函数。

您当前的问题是您覆盖了很多值，并且您没有检查正确的按钮。这也使它过于复杂。

您可以通过确保输入是实际数字来进一步开发此转换器 - 使用filter_var()标记符合您的需要。您可以验证或清理它，请参阅FILTER_SANITIZE vs FILTER VALIDATE, whats the difference - and which to use?。

<?php 
if (isset($_POST['submit'])) {
    switch ($_POST['convert']) {
        case "cm-in":
            $result = centimeter_to_inches($_POST['value']);
            $old_unit = 'cm';
            $new_unit = ' inches';
            break;
        case "in-cm":
            $result = inches_to_centimeter($_POST['value']);
            $old_unit = ' inches';
            $new_unit = 'cm';
            break;
        case "f-c":
            $result = fahrenheit_to_celsius($_POST['value']);
            $old_unit = ' Farenheit';
            $new_unit = ' Celcius';
            break;
        case "c-f":
            $result = celsius_to_fahrenheit($_POST['value']);
            $old_unit = ' Celcius';
            $new_unit = ' Farenheit';
            break;
    }
}

function fahrenheit_to_celsius($given_value) {
    return 5/9*($given_value-32);
}

function celsius_to_fahrenheit($given_value) {
    return $given_value*9/5+32;
}

function inches_to_centimeter($given_value) {
    return $given_value/2.54;
}

function centimeter_to_inches($given_value) {
    return $given_value*2.54;
}
?>


<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>Conversions</title>
    </head>
    <body>
        <form method="post">
            Convert <input type="text" name="value" /><br />
            <select name="convert">
                <option value="">--Select one--</option>
                <optgroup label="Units of Length">
                    <option value="cm-in">Centimeter to inches</option>
                    <option value="in-cm">Inches to centimeter</option>
                </optgroup>

                <optgroup label="Units of Temperature">
                    <option value="f-c">Farenheit to Celcius</option>
                    <option value="c-f">Celcius to Farenheit</option>
                </optgroup>
            </select>
            <input type="submit" name="submit" value="Convert" />
        </form>

        <?php 
        if (!empty($result))
            echo '<p>'.$_POST['value'].$old_unit.' equals '.$result.$new_unit.'</p>';
        ?>
    </body>
</html>

单位转换器PHP

2 个答案: