php获取页面指定标签内容的实现代码分享
可以匹配任意可闭合带id标签<?php
header ( "Content-type: text/html; charset=utf-8" );/*
* 参数说明: $tag_id:所要获取的元素Tag Id $url:所要获取页面的Url $tag:所要获取的标签 $data */ function getWebTag($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; }//test
echo getWebTag ( 'id="content"', ', 'div' ); ?>