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Home  >  Article  >  Backend Development  >  PHP uses regular expressions to match the types and attribute values ​​of all elements in the form

PHP uses regular expressions to match the types and attribute values ​​of all elements in the form

高洛峰
高洛峰Original
2017-03-01 16:27:341352browse

前言

最近工作中遇到一个需求，需要在正则匹配页面中，所有可能存在的 form 表单的元素，可能有 input，action,select,textarea等等所有可能的元素，本文给出一个代码示例。感兴趣的朋友们可以参考学习。

实例代码如下

假设页面 1.html 的网页源代码是：

<!DOCTYPE html>
<html>
 <head>
 <meta charset="utf-8" />
 <title>一个含有 form 表单的登录注册页面</title>
 <style type="text/css">
 *{padding:0;margin:0;font-size:12px;}
 .tbl{margin:20px auto;border:1px solid #AACCEE;padding:30px 30px;border-radius:4px;}
 .tbl td{line-height:30px;vertical-align:top;}
 textarea{resize:none;height:60px;}
 </style>
 </head>
 <body>
 <form action="register.php" method="post">
 <input type="hidden" name="cookie" value="SJKjki80KJ8jkl2" />
 <table cellpadding="0" cellspacing="0" class="tbl"> 
 <tr>
 <th colspan="2">注册</th>
 </tr>
 <tr>
 <td>昵称：</td>
 <td><input type="text" name = &#39;name&#39; required="" /></td>
 </tr>
 <tr>
 <td>密码：</td>
 <td><input name="password" type="password" required="required" /></td>
 </tr>
 <tr>
 <td>年龄：</td>
 <td><input name="age" value="22" required="required" ></td>
 </tr>
 <tr>
 <td>性别：</td>
 <td>
 <input type="radio" name="sex" value="1" /> 男
 <input type="radio" name="sex" value="0" /> 女
 </td>
 </tr>
 <tr>
 <td>地区：</td>
 <td>
 <select name="area">
 <option value="jiangsu">江苏</option>
 <option value="shandong">山东</option>
 <option value="fujian">福建</option>
 <option value="beijing">北京</option>
 </select>
 </td>
 </tr>
 <tr>
 <td>城市：</td>
 <td>
 <select name="city">
 <option value="qingdao">青岛</option>
 <option value="longyan">龙岩</option>
 <option value="beijing">北京</option>
 <option value="wuxi">无锡</option>
 </select>
 </td>
 </tr>
 <tr>
 <td>兴趣：</td>
 <td>
 <input type="checkbox" name="xingqu[]" value="1" > 篮球
 <input type="checkbox" name="xingqu[]" value="2"> 足球
 <input type="checkbox" name="xingqu[]" value="3" > 跳高
 </td>
 </tr>
 <tr>
 <td>照片：</td>
 <td><input type="file" name="photo" /></td>
 </tr>
 <tr>
 <td>简介：</td>
 <td><textarea name="summary" required="">这里填入个人简介</textarea></td>
 </tr>
 <tr>
 <td>备注：</td>
 <td><textarea name="remark" required="">1</textarea ></td>
 </tr>
 <tr>
 <td colspan="2"><input type="submit" name="register" value="注册"></td>
 </tr>
 </table> 
 </form>
 <form action="login.php" method="post">
 <table cellpadding="0" cellspacing="0" class="tbl">
 <tr>
 <th colspan="2">登录</th>
 </tr>
 <tr>
 <td>昵称：</td>
 <td><input type="text" name = &#39;name&#39; required="required" /></td>
 </tr>
 <tr>
 <td>密码：</td>
 <td><input name="password" type="password" required="required" /></td>
 </tr>
 <tr>
 <td>备注：</td>
 <td><textarea name="remark" required="">2</textarea></td>
 </tr> 
 <tr>
 <td colspan="2"><input type="submit" name="register" value="登录"></td>
 </tr>
 </table> 
 </form> 
 </body>
</html>

我们需要获取到这个页面所有 form 表单，及每个 form 表单所包含的各类表单元素，例如：input，select，textarea等等。

匹配的源代码是：

$content = file_get_contents(&#39;1.html&#39;);
$arr_form = get_page_form_data($content);
if(empty($arr_form))
{
 echo &#39;抱歉！未匹配到 form 表单元素&#39;;
}else
{
 foreach($arr_form as $k => $v)
 {
 echo &#39;form&#39;.($k+1).&#39;:<br />&#39;;
 if(!empty($v[&#39;action&#39;]))
 {
 echo &#39;----action：<br />&#39;;
 echo &#39;--------&#39;.$v[&#39;action&#39;].&#39;<br />&#39;;
 }
 if(!empty($v[&#39;method&#39;]))
 {
 echo &#39;----method：<br />&#39;;
 echo &#39;--------&#39;.$v[&#39;method&#39;].&#39;<br />&#39;;
 } 
 if(!empty($v[&#39;inputs&#39;]))
 {
 echo &#39;----inputs：<br />&#39;;
 foreach($v[&#39;inputs&#39;] as $key => $value)
 {
 echo &#39;--------name：&#39;.$value[&#39;name&#39;].&#39; type：&#39;.$value[&#39;type&#39;].&#39; value：&#39;.$value[&#39;value&#39;].&#39;<br />&#39;;
 }
 } 
 if(!empty($v[&#39;textarea&#39;]))
 {
 echo &#39;----textarea：<br />&#39;;
 foreach($v[&#39;textarea&#39;] as $key => $value)
 {
 echo &#39;--------name：&#39;.$value[&#39;name&#39;].&#39; value：&#39;.$value[&#39;value&#39;].&#39;<br />&#39;;
 }
 } 
 if(!empty($v[&#39;select&#39;]))
 {
 echo &#39;----select：<br />&#39;;
 for($m = 0;$m < count($v[&#39;select&#39;]);$m ++)
 {
 echo &#39;--------name：&#39;.$v[&#39;select&#39;][$m][&#39;name&#39;].&#39;<br />&#39;;
 if(!empty($v[&#39;select&#39;][$m][&#39;option&#39;]))
 {
 foreach ($v[&#39;select&#39;][$m][&#39;option&#39;] as $key => $value) 
 {
 echo &#39;------------value：&#39;.$value.&#39;<br />&#39;;
 }
 }
 }
 }
 }
}
// 获取页面中的 form 表单中的所有 input、textarea 元素中 name、value、type 等属性值
function get_page_form_data($content)
{
 $arr_form = array();
 $form = regular_form_tags($content);
 for($i = 0;$i < count($form[0]);$i ++)
 {
 $arr_form[$i][&#39;action&#39;] = regular_form_action($form[1][$i]);
 $arr_form[$i][&#39;method&#39;] = regular_form_method($form[1][$i]);
 $input = regular_input_tags($form[2][$i]);
 for($j = 0;$j < count($input[0]);$j ++)
 {
 $arr_form[$i][&#39;inputs&#39;][$j][&#39;name&#39;] = regular_input_name($input[0][$j]);
 $arr_form[$i][&#39;inputs&#39;][$j][&#39;type&#39;] = regular_input_type($input[0][$j]);
 $arr_form[$i][&#39;inputs&#39;][$j][&#39;value&#39;] = regular_input_value($input[0][$j]);
 }
 $textarea = regular_textarea_tags($form[2][$i]);
 for($k = 0;$k < count($textarea);$k ++)
 {
 $arr_form[$i][&#39;textarea&#39;][$k][&#39;name&#39;] = regular_textarea_name($textarea[$k]);
 $arr_form[$i][&#39;textarea&#39;][$k][&#39;value&#39;] = regular_textarea_value($textarea[$k]);
 }
 $select = regular_select_tags($form[2][$i]);
 for($l = 0;$l < count($select[0]);$l ++)
 {
 $arr_form[$i][&#39;select&#39;][$l][&#39;name&#39;] = regular_select_name($select[1][$l]);
 $option = regular_option_tags($select[2][$l]);
 for($n = 0;$n < count($option[$l]);$n ++)
 {
 $arr_form[$i][&#39;select&#39;][$l][&#39;option&#39;][$n] = regular_option_value($option[$l][$n]);
 } 
 }
 }
 return $arr_form;
}
// 正则匹配 form 标签
function regular_form_tags($string)
{ 
 $pattern = &#39;/<form(.*?)>(.*?)<\/form>/si&#39;; 
 preg_match_all($pattern,$string,$result);
 return $result;
}
// 正则匹配 form 标签的 action 属性值
function regular_form_action($string)
{
 $pattern = &#39;/action[\s]*?=[\s]*?([\&#39;\"])(.*?)\1/&#39;;
 if(preg_match($pattern,$string,$result))
 {
 return $result[2];
 }
 return null;
}
// 正则匹配 form 标签的 method 属性值
function regular_form_method($string)
{
 $pattern = &#39;/method[\s]*?=[\s]*?([\&#39;\"])(.*?)\1/&#39;;
 if(preg_match($pattern,$string,$result))
 {
 return $result[2];
 }
 return null;
}
// 正则匹配 input 标签
function regular_input_tags($string)
{
 $pattern = &#39;/<input.*?\/?>/si&#39;; 
 if(preg_match_all($pattern,$string,$result))
 {
 return $result; 
 }
 return null;
}
// 正则匹配 input 标签的 name 属性值
function regular_input_name($string)
{
 $pattern = &#39;/name[\s]*?=[\s]*?([\&#39;\"])(.*?)\1/&#39;;
 if(preg_match($pattern,$string,$result))
 {
 return $result[2];
 }
 return null;
 
}
// 正则匹配 input 标签的 type 属性值
function regular_input_type($string)
{
 $pattern = &#39;/type[\s]*?=[\s]*?([\&#39;\"])(.*?)\1/&#39;;
 if(preg_match($pattern,$string,$result))
 {
 return $result[2];
 }
 return null;
}
// 正则匹配 input 标签的 value 属性值
function regular_input_value($string)
{
 $pattern = &#39;/value[\s]*?=[\s]*?([\&#39;\"])(.*?)\1/&#39;;
 if(preg_match($pattern,$string,$result))
 {
 return $result[2];
 }
 return null; 
}
// 正则匹配 textarea 标签
function regular_textarea_tags($string)
{
 $pattern = &#39;/(<textarea.*?>.*?<\/textarea[\s]*?>)/si&#39;; 
 if(preg_match_all($pattern,$string,$result))
 {
 return $result[1];
 }
 return null;
}
// 正则匹配 textarea 标签的 name 属性值
function regular_textarea_name($string)
{
 $pattern = &#39;/name[\s]*?=[\s]*?([\&#39;\"])(.*?)\1/si&#39;; 
 if(preg_match($pattern,$string,$result))
 {
 return $result[2];
 }
 return null;
}
// 正则匹配 textarea 标签的 name 属性值
function regular_textarea_value($string)
{
 $pattern = &#39;/<textarea.*?>(.*?)<\/textarea>/si&#39;; 
 if(preg_match($pattern,$string,$result))
 {
 return $result[1];
 }
 return null;
}
// 正则匹配 select 标签
function regular_select_tags($string)
{
 $pattern = &#39;/<select(.*?)>(.*?)<\/select[\s]*?>/si&#39;;
 preg_match_all($pattern,$string,$result);
 return $result;
}
// 正则匹配 select 标签的 option 子标签
function regular_option_tags($string)
{
 $pattern = &#39;/<option(.*?)>.*?<\/option[\s]*?>/si&#39;;
 preg_match_all($pattern,$string,$result);
 return $result; 
}
// 正则匹配 select 标签的 name 属性值
function regular_select_name($string)
{
 $pattern = &#39;/name[\s]*?=[\s]*?([\&#39;\"])(.*?)\1/si&#39;;
 if(preg_match($pattern,$string,$result))
 {
 return $result[2];
 }
 return null;
}
// 正则匹配 select 的子标签 option 的 value 属性值
function regular_option_value($string)
{
 $pattern = &#39;/value[\s]*?=[\s]*?([\&#39;\"])(.*?)\1/si&#39;;
 if(preg_match($pattern,$string,$result))
 {
 return $result[2];
 }
 return null;
}

运行效果如下图所示：

PHP uses regular expressions to match the types and attribute values ​​of all elements in the form

PHP uses regular expressions to match the types and attribute values ​​of all elements in the form

这样我们就可以实现获取任意一个页面中的 form 表单所有存在的元素啦！

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