php gets the value of form form list box-PHP Tutorial-php.cn

List boxes come in two forms: drop-down list boxes and menu list boxes, and their basic syntax is the same. When designing website programs, drop-down list boxes and menu list boxes are widely used. Condition selection can be achieved through drop-down list boxes and menu list boxes.

1. Get the value of the drop-down list box

The method of getting the value of the drop-down list box is very simple, and it is the same as getting the value of the text box Similarly, you first need to define the name attribute value of the drop-down list box, and then use $_POST[] global variable to get the value.

The following uses an example to explain how to obtain the value of the drop-down list box. This example is to select the user-specified condition in the drop-down list box, click the "Submit" button, and output the condition value selected by the user. The specific operation steps are as follows:

(1) Create a new index.php page, create a form, add a drop-down list box and a submit button, the main code is as follows:

<!DOCTYPE html>
<html lang="en">
<head>
   <meta charset="UTF-8">
   <title>form</title>
</head>
<body>
<form action="" method="post" name="form1">
   <table width="300"  border="0" cellpadding="0"  cellspacing="0">
      <tr>
         <td width="100" height="30" align="center" >
            <span class="style2">选择部门:</span>
         </td>
         <td width="200">
            <select name="select" size="1">
               <option value="销售部" selected>销售部</option>
               <option value="财务部" >财务部</option>
               <option value="行政部" >行政部</option>
               <option value="后勤部" >后勤部</option>
            </select> 
           <input type="submit" name="submit" value="提交">
         </td>
      </tr>
   </table>
</form>
</body>
</html>

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Note: In the code of this example, set the size attribute in the tag, it is a menu list box, and you can select multiple conditions. Since menu list boxes generally have multiple values existing at the same time, in order to facilitate value transfer, the , and an array named "select[]" Variable, add a submit button. The main code is as follows:

<!DOCTYPE html>
<html lang="en">
<head>
   <meta charset="UTF-8">
   <title>form</title>
</head>
<body>
<form action="index.php" method="post" name="form1">
   <table width="300"  border="0" cellpadding="0"  cellspacing="0">
      <tr>
         <td height="30" align="center" valign="middle">
 请选择喜欢的图书
 </td>
      </tr>
      <tr>
         <td align="center" valign="middle">
            <select name="select[]" size="4" multiple>
               <option value="PHP开发宝典">PHP开发宝典</option>
               <option value="数据库使用手册" >数据库使用手册</option>
               <option value="PHP从入门到精通" >PHP从入门到精通</option>
               <option value="函数大全" >函数大全</option>
            <select>
         </td>
      </tr>
      <tr>
         <td height="30" align="center" valign="middle">
            <input type="submit" name="submit" value="提交">
         </td>
      </tr>
   </table>
</form>
</body>
</html>

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Note: The code in this example sets the multiple attribute in the