php获取页面并切割页面div内容
亮点：1、利用php也能实现对页面div的切割处理。这里的做法抛砖引玉，希望读者能够提供更加完美的解决方案。
2、切割处理方法已经封装成一个方法，可以直接引用。
3、顺便加上博客园标签云的截取。//getWebDiv('id="taglist"','http://www.cnblogs.com/Zjmainstay/tag/');
View Code
<?php
header("Content-type: text/html; charset=utf-8");
function getWebDiv($div_id,$url=false,$data=false){
if($url !== false){
$data = file_get_contents( $url );
}
$charset_pos = stripos($data,'charset');
if($charset_pos) {
if(stripos($data,'charset=utf-8',$charset_pos)) {
$data = iconv('utf-8','utf-8',$data);
}else if(stripos($data,'charset=gb2312',$charset_pos)) {
$data = iconv('gb2312','utf-8',$data);
}else if(stripos($data,'charset=gbk',$charset_pos)) {
$data = iconv('gbk','utf-8',$data);
}
}
preg_match_all('/<div/i',$data,$pre_matches,PREG_OFFSET_CAPTURE); //获取所有div前缀
preg_match_all('/<\/div/i',$data,$suf_matches,PREG_OFFSET_CAPTURE); //获取所有div后缀
$hit = strpos($data,$div_id);
if($hit == -1) return false; //未命中
$divs = array(); //合并所有div
foreach($pre_matches as $index=>$pre_div){
$divs[(int)$pre_div] = 'p';
$divs[(int)$suf_matches[$index]] = 's';
}
//对div进行排序
$sort = array_keys($divs);
asort($sort);
$count = count($pre_matches);
foreach($pre_matches as $index=>$pre_div){
//<div $hit <div+1 时div被命中
if(($pre_matches[$index] < $hit) && ($hit < $pre_matches[$index+1])){
$deeper = 0;
//弹出被命中div前的div
while(array_shift($sort) != $pre_matches[$index] && ($count--)) continue;
//对剩余div进行匹配，若下一个为前缀，则向下一层，$deeper加1，
//否则后退一层，$deeper减1，$deeper为0则命中匹配，计算div长度
foreach($sort as $key){
if($divs[$key] == 'p') $deeper++;
else if($deeper == 0) {
$length = $key-$pre_matches[$index];
break;
}else {
$deeper--;
}
}
$hitDivString = substr($data,$pre_matches[$index],$length).'</div>';
break;
}
}
return $hitDivString;
}
echo getWebDiv('id="taglist"','http://www.cnblogs.com/Zjmainstay/tag/');
//End_php
考虑到id符号问题，id="u"由用户自己填写。
声明：此段php只针对带 id div内容的读取。
——————————————————————————完善：匹配任意可闭合带id标签————————————————————————————————————————————
View Code
1 <?php
2 header("Content-type: text/html; charset=utf-8");
3 function getWebTag($tag_id,$url=false,$tag='div',$data=false){
4 if($url !== false){
5 $data = file_get_contents( $url );
6 }
7 $charset_pos = stripos($data,'charset');
8 if($charset_pos) {
9 if(stripos($data,'charset=utf-8',$charset_pos)) {
10 $data = iconv('utf-8','utf-8',$data);
11 }else if(stripos($data,'charset=gb2312',$charset_pos)) {
12 $data = iconv('gb2312','utf-8',$data);
13 }else if(stripos($data,'charset=gbk',$charset_pos)) {
14 $data = iconv('gbk','utf-8',$data);
15 }
16 }
17
18 preg_match_all('/<'.$tag.'/i',$data,$pre_matches,PREG_OFFSET_CAPTURE); //获取所有div前缀
19 preg_match_all('/<\/'.$tag.'/i',$data,$suf_matches,PREG_OFFSET_CAPTURE); //获取所有div后缀
20 $hit = strpos($data,$tag_id);
21 if($hit == -1) return false; //未命中
22 $divs = array(); //合并所有div
23 foreach($pre_matches as $index=>$pre_div){
24 $divs[(int)$pre_div] = 'p';
25 $divs[(int)$suf_matches[$index]] = 's';
26 }
27
28 //对div进行排序
29 $sort = array_keys($divs);
30 asort($sort);
31
32 $count = count($pre_matches);
33 foreach($pre_matches as $index=>$pre_div){
34 //<div $hit <div+1 时div被命中
35 if(($pre_matches[$index] < $hit) && ($hit < $pre_matches[$index+1])){
36 $deeper = 0;
37 //弹出被命中div前的div
38 while(array_shift($sort) != $pre_matches[$index] && ($count--)) continue;
39 //对剩余div进行匹配，若下一个为前缀，则向下一层，$deeper加1，
40 //否则后退一层，$deeper减1，$deeper为0则命中匹配，计算div长度
41 foreach($sort as $key){
42 if($divs[$key] == 'p') $deeper++;
43 else if($deeper == 0) {
44 $length = $key-$pre_matches[$index];
45 break;
46 }else {
47 $deeper--;
48 }
49 }
50 $hitDivString = substr($data,$pre_matches[$index],$length).'</'.$tag.'>';
51 break;
52 }
53 }
54 return $hitDivString;
55 }
56
57 echo getWebTag('id="nav"','http://mail.163.com/html/mail_intro/','ul');
58 echo getWebTag('id="homeBanners"','http://mail.163.com/html/mail_intro/');
59 echo getWebTag('id="performance"','http://mail.163.com/html/mail_intro/','section');
60
61 //End_php
修复：stripos($data,'charset=utf-8',$charset_pos) 加入charset=，避免有些gb2312格式的网页中包含utf-8造成错误。或者用户可以自行修改函数传入一个确定的charset参数。
演示地址：parseDiv
页:
[1]