帮我看下，正则怎样给匹配的img添加p标签？

Question

让这段正则：$str= preg_replace("/<img.*?src=\"(.+?)\".*?>/","<img src=\"\\1\" width='300' height='inherit'/>",  $str);
输出后变成：<p><img width="300" height="inherit"></p>
自己尝试修改，发现无效：$str= preg_replace("/<img.*?src=\"(.+?)\".*?>/","<p><img src=\"\\1\" width='300' height='inherit'/><\/p>",  $str);

Answer 1

$str = '<img src="http://php.p2hp.com/images/logos/php-logo.svg">';
$str = preg_replace("/<img.*?src=\"(.+?)\".*?>/", "<p><img src=\"\\1\" width=\"300\" height=\"inherit\"/></p>", $str);    
exit($str);