<?php
$string="<php>1<p>02</p><p>888</p></php><p>123</p><php><p>234</p></php>";
$pattern = '/<php>([\s\S]*)<\/php>/iU';
preg_match_all($pattern,$string,$d);
foreach ($d[1] as $val) {
$string = str_replace($val,strip_tags($val),$string);
}
echo $string;
?>
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