php利用正则表达式解决采集内容排版问题

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。

/**
 * 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 (
			"//i" => '',
			"/<\/font>/i" => '',
			"//i" => '',
			"/<\/strong>/i" => '',
			"//i" => '',
			"/<\/span>/i" => '',
			"//i" => "
",
			"/<\/div>/i" => "
",
			"//i"=>'',
			/* "//i" => '',//遇到有表格的内容就不要启用
			"/<\/table>/i" => '',
			"//i" => '',
			"/<\/tbody>/i" => '',
			"//i" => '
',
			"/<\/tr>/i" => '
',
			"//i" => '', */
			"/style=.+?['|\"]/i" => '',
			"/class=.+?['|\"]/i" => '',
			"/id=.+?['|\"]/i"=>'',
			"/lang=.+?['|\"]/i"=>'',
			//"/width=.+?['|\"]/i"=>'',//不好控制注释掉
			//"/height=.+?['|\"]/i"=>'',
			"/border=.+?['|\"]/i"=>'',
			"/face=.+?['|\"]/i"=>'',
			"/[　]*/i" => "
",
			"/.*<\/iframe>/i" => '',
			"/ /i" => ' ',//空格替换掉
			"/[ |\x{3000}|\r\n]*/ui" => '
    ',//替换半角、全角空格，换行符，用 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,'
')>6)//部分内容开头可能缺失
标签
		$content = '
    '.$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;
}