PHP tutorial form submission example_PHP tutorial

A super simple form submission example of PHP tutorial for beginners. Friends in need can refer to it. Below we will create a complex form with the code shown below.

代码如下

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<form action="someform.php" method="post"><br><table width="541" border="0"><br> <tr><br> <td width="26%">姓名：</td><br> <td width="74%"><input type="text" name="username" value="raymond" id="username"/></td><br> </tr><br> <tr><br> <td>密码：</td><br> <td><input type="password" name="password" maxlength="10" id="password"/></td><br> </tr><br> <tr><br> <td>年龄：</td><br> <td><br> <select name="age"><br> <option value=">16">小于16</option><br> <option value="16-30" selected>16-30</option><br> <option value="31-50">31-50</option><br> <option value="51-80">51-80</option><br> </select><br> </td><br> </tr><br> <tr><br> <td valign="top">自我介绍:</td><br> <td><textarea name="intro" rows="3" cols="50" id="intro">请输入您的自我介绍</textarea></td><br> </tr><br> <tr><br> <td><br /><br>体育爱好： </td><br> <td><input type="radio" name="fave_sport" value="tennis" checked><br>网球<br> <input type="radio" name="fave_sport" value="football"><br>足球<br><input type="radio" name="fave_sport" value="baseball"><br>篮球<br><input type="radio" name="fave_sport" value="polo"><br>保龄球 </td><br> </tr><br> <tr><br> <td> 开发语言：</td><br> <td><input name="from" type="hidden" id="from" value="注册表单"><br> <input type="checkbox" name="languages[]" value="php" checked id="languages[]"><br>php<br><input type="checkbox" name="languages[]" value="java" id="languages[]"><br>java<br><input type="checkbox" name="languages[]" value="perl" id="languages[]"><br>perl<br><input type="checkbox" name="languages[]" value="cpp" id="languages[]"><br>c++<br><input type="checkbox" name="languages[]" value=".net" id="languages[]"><br>.NET<br><input type="checkbox" name="languages[]" value="delphi" id="languages[]"><br>delphi </td><br> </tr><br> <tr><br> <td valign="top"><br><br> <label> 开发工具：</label></td><br> <td><select name="develop_ide[]" size="5" multiple id="develop_ide[]"><br> <option value="ZDE" selected>Zend Studio</option><br> <option value="Eclipse">Eclipse</option><br> <option value="Editplus">Editplus</option><br> <option value="Ultraedit">Ultraedit</option><br> <option value="Other">Other</option><br> </select></td><br> </tr><br> <tr><br> <td valign="top"> </td><br> <td><input type="submit" name="btn_submit" value="提交"/></td><br> </tr><br></table><br></form>

This form includes common form elements: single-line text box, multi-line text box, single option (radio), multiple options (checkbox), and multi-select menu. Detailed explanation is provided below.
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maxlength is an attribute associated with the password text box, which limits the maximum length of the user's password to 10 characters.
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The age list box is a list menu with its own values ​​for selection under its named properties. Selected is a specific attribute selection element. If an option is attached with this attribute, the item will be listed as the first item when displayed.
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The content in the intro text box displays text, row and column widths according to rows and cols.
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fave_sport is a group of radio buttons (radio). We need to name the elements according to the group. For example, this group of radio buttons is called fave_sport. The user can only select one, and there is only one value in the sending script.
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Like the single option, all multi-option members must also have attributes with the same name, and brackets [] need to be added to the attribute name, so that the value of the multi-option is sent to PHP in the form of an array, languages ​​is this form.
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The checked tag refers to a certain value in single option and multi-option, which is selected by default. The display screen of the above form is shown in Figure 5-3. Figure 5-3 Because the form form in the above HTML uses the POST method to transfer data, the data submitted by the user will be saved in the super global array of $_POST or $_REQUEST. We can process the submitted data based on the value in the $_POST array. Submit the data in the above form to the someform.php script. The processing logic of the script is as follows:

代码如下

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//通过判断按钮的变量名是否在$_POST中定义，如果有表示该表单已提交<br>if(isset($_POST["btn_submit"])){<br>if (empty($_POST['username'])){<br>echo "您没有输入用户名";<br>exit(0);<br>}<br>if (empty($_POST['password'])){<br>echo "您没有输入密码: ";<br>exit(0);<br>}<br>echo "您的用户名： ".$_POST['user_name']."<br>";<br>echo "您的密码(明文)： ".$_POST['password']."<br>";<br>echo "您的年龄： ".$_POST['age']."<br>";<br>if (!empty($_POST['languages'])){<br>echo "您选择的语言为：";<br>//处理用户选择兴趣的checkbox按钮产生的数组<br>foreach ($_POST['languages'] as $lang){<br>echo $lang. " ";<br>}<br>} else {<br>echo "您没有输入任何兴趣爱好";<br>}<br>if (!empty($_POST['develop_ide'])){<br>echo "您使用的开发工具为：";<br>//处理用户多选开发工具菜单产生的数组<br>foreach ($_POST['develop_ide'] as $ide){<br>echo $ide. " ";<br>}<br>} else {<br>echo "您没有选择开发工具";<br>}<br>echo "您的自我介绍： ".nl2br($_POST['intro'])."<br />";//nl2br()，在字符串中的每个新行 (n) 之前插入 HTML 换行符 (<br />)<br>";<br>echo "网页隐藏值(通过hidden标签值传递)： ".$_POST['from']."<br>";<br>}<br>?>

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