从 php 中的所选选项声明两个变量

Question

我有这个项目，我必须在其中为相应的 selected 选项声明“宽度”和“高度”的子变量，即“小”或“大”。例如，如果用户 select 从选项中选择“small”，那么系统应该为“small”保存两个变量“width”和“height”。非常感谢您对这个问题的帮助。如果您还有其他问题，请尽管提问。谢谢

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script type="text/javascript" src="js.js"></script>
    <script type="text/javascript" src="jquery.js"></script>
</head>
<body>
<!--name.php to be called on form submission--> 
<form method = 'post'>  
            <h4>CALCULATOR</h4> 
              
            <label>Select Plate Size</label>
            <select name = 'plateSelector'>   
                <option value = 'Small Plate' name="small">Small Plate</option> 
                <option value = 'Large Plate' name="large">Large Plate</option> 
            </select> 
            <input type = 'submit' name = 'submit' value = Submit> 
        </form> 
    
</body>
<script type="text/javascript">

</script>
</html>
<?php 
      
    // Check if form is submitted successfully 
    if(isset($_POST["submit"]))  
    { 
        // Check if any option is selected 
        if(isset($_POST["plateSelector"]))  
        { 
            $plate = $_GET["small"];
            if($plate)
            {
                $height=5;
                $width=5;
                print "$height and $width<br/>"; 
            }
            else{
                print"this"; 
            }
        } 
    else
        echo "Select an option first !!"; 
    } 
?>

Answer 1

有很多方法可以完成这项工作（例如，您可以将两条数据存储在一个数据库中），但是一种更简单的方法是将两个变量（宽度和高度）放入一个字符串中，然后然后用分隔符分隔它们（例如##）。

例如字符串12.2##22.2可以表示width=12.2和height=22.2

您可以参考以下工作代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script type="text/javascript" src="js.js"></script>
    <script type="text/javascript" src="jquery.js"></script>
</head>
<body>
<!--name.php to be called on form submission--> 
<form method ='post' action="">  
            <h4>CALCULATOR</h4> 
              
<label>Select Plate Size</label>
<select name = 'plateSelector'>   
<option value = '' >Please choose</option> 
<option value = '12.2##22.2'  >Small Plate</option> 
<option value = '100.2##99.1' >Large Plate</option> 
</select> 
<input type = 'submit' name = 'submit' value = Submit> 
        </form> 
    
</body>
<script type="text/javascript">

</script>
</html>

<?php 
      
if(isset($_POST["submit"]))  { 
   $plate = $_POST["plateSelector"];
   if($plate) {
   $pieces = explode("##", $plate);
   echo "width is: ". $pieces[0] . ",  height is: " . $pieces[1]; 
   } else {
   echo  "Please select an option"; 
   }
} 

?>

从 php 中的所选选项声明两个变量

Declare two variables from the selected option in php

php

html

variables

option