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

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 ( '/

preg_match_all ( '/

$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 ) {

//