php正则表达式去掉html标签

过滤除了src之外的所有属性:

$str= preg_replace('/\s(?!src)[a-zA-Z]+=[\'\"]{1}[^\'\"]+[\'\"]{1}/iu',' $str);

过滤设置过滤除了alt和src之外的所有属性

$str = preg_replace('/\s(?!(src|alt))[a-zA-Z]+=[^\s]*/iu',' ', $str);

过滤所有html标签的属性的正则表达式:

$str = preg_replace("/<([a-z]+)[^>]*>/i","",$str );

只过滤alt属性的正则表达式:

(\s)alt=[^\s]*

过滤所有html标签的属性的正则表达式:

$search = array ("']*?>.*?'si", // 去掉 javascript

"'<[\/\!]*?[^<>]*?>'si", // 去掉 HTML 标记

"'([\r\n])[\s]+'", // 去掉空白字符

"'&(quot|#34);'i", // 替换 HTML 实体

"'&(amp|#38);'i",

"'&(lt|#60);'i",

"'&(gt|#62);'i",

"'&(nbsp|#160);'i"

); // 作为 PHP 代码运行

$replace = array ("","","\\1","\"","&","<",">"," ");

$html = preg_replace($search, $replace, $html);