preg replace - php - strip same tags as parent tag -

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how can strip same tags parent tag using preg_replace ? example have tag called <strip> , want strip child tags <strip> example <strip><strip>avoid tag</strip></strip> want become --> <strip>avoid tag</strip> don't know preg_* thats have: 

preg_replace_callback(   '#\<strip\>(.+?)\<\/strip\>#s',   create_function(     '$matches',     'return "<strip>".htmlentities($matches[1])."</strip>";'   ),   $content );

this little function apply htmlentities inside <strip> tags , idon't want <strip> tag repeated inside each other

thanks

please dont user regex html dom, take @ domxpath doc here

a shot exemple here :

$doc = new domdocument(); $doc->loadhtmlfile($file); $xpath = new domxpath($doc); $elements = $xpath->query("/html/body/*"); foreach ($elements $element) {     $nodes = $element->childnodes;     foreach ($nodes $node) {       //do stuff here :)        echo $node->nodevalue. "\n";     } }

if it's xml take @ simplexmlelement here


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