php切割页面div内容的实现代码分享

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、顺便加上标签云的截取。//getWebDiv('id="taglist"','https://3water.com/tag/');

<?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,'utf-8',$charset_pos)) { 
$data = iconv('utf-8','utf-8',$data); 
}else if(stripos($data,'gb2312',$charset_pos)) { 
$data = iconv('gb2312','utf-8',$data); 
}else if(stripos($data,'gbk',$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[0] as $index=>$pre_div){ 
$divs[(int)$pre_div[1]] = 'p'; 
$divs[(int)$suf_matches[0][$index][1]] = 's'; 
} 
//对div进行排序 
$sort = array_keys($divs); 
asort($sort); 
$count = count($pre_matches[0]); 
foreach($pre_matches[0] as $index=>$pre_div){ 
//<div $hit <div+1 时div被命中 
if(($pre_matches[0][$index][1] < $hit) && ($hit < $pre_matches[0][$index+1][1])){ 
$deeper = 0; 
//弹出被命中div前的div 
while(array_shift($sort) != $pre_matches[0][$index][1] && ($count--)) continue; 
//对剩余div进行匹配，若下一个为前缀，则向下一层，$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[0][$index][1]; 
break; 
}else { 
$deeper--; 
} 
} 
$hitDivString = substr($data,$pre_matches[0][$index][1],$length).'</div>'; 
break; 
} 
} 
return $hitDivString; 
} 
echo getWebDiv('id="taglist"','https://3water.com/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 
<?php 
header("Content-type: text/html; charset=utf-8"); 
function getWebTag($tag_id,$url=false,$tag='div',$data=false){ 
if($url !== false){ 
$data = file_get_contents( $url ); 
} 
$charset_pos = stripos($data,'charset'); 
if($charset_pos) { 
if(stripos($data,'utf-8',$charset_pos)) { 
$data = iconv('utf-8','utf-8',$data); 
}else if(stripos($data,'gb2312',$charset_pos)) { 
$data = iconv('gb2312','utf-8',$data); 
}else if(stripos($data,'gbk',$charset_pos)) { 
$data = iconv('gbk','utf-8',$data); 
} 
} 
preg_match_all('/<'.$tag.'/i',$data,$pre_matches,PREG_OFFSET_CAPTURE); //获取所有div前缀 
preg_match_all('/<\/'.$tag.'/i',$data,$suf_matches,PREG_OFFSET_CAPTURE); //获取所有div后缀 
$hit = strpos($data,$tag_id); 
if($hit == -1) return false; //未命中 
$divs = array(); //合并所有div 
foreach($pre_matches[0] as $index=>$pre_div){ 
$divs[(int)$pre_div[1]] = 'p'; 
$divs[(int)$suf_matches[0][$index][1]] = 's'; 
} 
//对div进行排序 
$sort = array_keys($divs); 
asort($sort); 
$count = count($pre_matches[0]); 
foreach($pre_matches[0] as $index=>$pre_div){ 
//<div $hit <div+1 时div被命中 
if(($pre_matches[0][$index][1] < $hit) && ($hit < $pre_matches[0][$index+1][1])){ 
$deeper = 0; 
//弹出被命中div前的div 
while(array_shift($sort) != $pre_matches[0][$index][1] && ($count--)) continue; 
//对剩余div进行匹配，若下一个为前缀，则向下一层，$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[0][$index][1]; 
break; 
}else { 
$deeper--; 
} 
} 
$hitDivString = substr($data,$pre_matches[0][$index][1],$length).'</'.$tag.'>'; 
break; 
} 
} 
return $hitDivString; 
} 
echo getWebTag('id="nav"','http://mail.163.com/html/mail_intro/','ul'); 
echo getWebTag('id="homeBanners"','http://mail.163.com/html/mail_intro/'); 
echo getWebTag('id="performance"','http://mail.163.com/html/mail_intro/','section'); 
//End_php

作者： Zjmainstay