<?php
$string = 'Lorem ipsum /dolor sit amet/, consectetur /adipiscing elit/ aaaa /adipiscing elit/.';
 
 
function removeParseContentBar($string)
{
	$arr = str_split($string);
	$i=0;
    foreach ($arr as $k => $char) {
        if ($char == '/') {
           $arr[$k] = ($i % 2 == 0) ? '<' :  '/>';
        } else {
          $arr[$k] = $char;
   	      $i++;
        }
    $i++;
    } 
    $content = implode('',$arr);
    return strip_tags($content); 
}
echo removeParseContentBar($string);

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