做采集经常遇到的问题是内容排版问题，用了一些时间写了个用正则替换html标签和样式的函数，共享下。
复制代码 代码如下:
/**
* 格式化内容
* @param string $content 内容最好统一用utf-8编码
* @return string
* !本函数需要开启tidy扩展
*/
function removeFormat($content) {
$replaces = array (
"/<font.*?>/i" => '',
"/<\/font>/i" => '',
"/<strong>/i" => '',
"/<\/strong>/i" => '',
"/<span.*?>/i" => '',
"/<\/span>/i" => '',
"/<div.*?>/i" => "<p>",
"/<\/div>/i" => "</p>",
"/<!--<.*?>*-->/i"=>'',
/* "/<table.*?>/i" => '',//遇到有表格的内容就不要启用
"/<\/table>/i" => '',
"/<tbody.*?>/i" => '',
"/<\/tbody>/i" => '',
"/<tr.*?>/i" => '<p>',
"/<\/tr>/i" => '</p>',
"/<td.*?>/i" => '', */
"/style=.+?['|\"]/i" => '',
"/class=.+?['|\"]/i" => '',
"/id=.+?['|\"]/i"=>'',
"/lang=.+?['|\"]/i"=>'',
//"/width=.+?['|\"]/i"=>'',//不好控制注释掉
//"/height=.+?['|\"]/i"=>'',
"/border=.+?['|\"]/i"=>'',
"/face=.+?['|\"]/i"=>'',
"/<br.*?>[　]*/i" => "</p><p>",
"/<iframe.*?>.*<\/iframe>/i" => '',
"/&nbsp;/i" => ' ',//空格替换掉
"/<p.*?>[ |\x{3000}|\r\n]*/ui" => '<p>&nbsp;&nbsp;&nbsp;&nbsp;',//替换半角、全角空格，换行符，用&nbsp;排除写入数据库时产生的编码问题

);
$config = array(
//'indent' => TRUE, //是否缩进
'output-html' => TRUE,//是否是输出xhtml
'show-body-only'=>TRUE,//是否只获得到body
'wrap' => 0
);
$content = tidy_repair_string($content, $config, 'utf8');//先利用php自带的tidy类库修复html标签，不然替换的时候容易出现各种诡异的情况
$content = trim($content);
foreach ( $replaces as $k => $v ) {
$content = preg_replace ( $k, $v, $content );
}

if(strpos($content,'<p>')>6)//部分内容开头可能缺失<p>标签
$content = '<p>&nbsp;&nbsp;&nbsp;&nbsp;'.$content;

$content = tidy_repair_string($content, $config, 'utf8');//再修复一次，可以去除html空标签
$content = trim($content);
return $content;
}