strip selected tags working, string replacement not

Hello,
Please could you tell me why, in the following code, the strip_selected_tags function is working perfectly, but the _replacement($text) is not:

function strip_selected_tags($str, $tags = "", $stripContent = false){
        preg_match_all("/<([^>]+)>/i",$tags,$allTags,PREG_PATTERN_ORDER);
        foreach ($allTags[1] as $tag){
            if ($stripContent) {
                $str = preg_replace("/<".$tag."[^>]*>.*<\/".$tag.">/iU","",$str);
            }
            $str = preg_replace("/<\/?".$tag."[^>]*>/iU","",$str);
        }
        return $str;
    }
function _replacement($text) {
$array = array("sabbatical" => "removed", "Wood" => "Tree", "Reporter" => "Journalist");
foreach($array as $original => $replacement) {
$text = str_replace($original, $replacement, $text);
}
return $text;
}
foreach($wsql->fetch_objects() as $obj){

   print _replacement($text);
   print strip_selected_tags($obj->text, '<a><img>');

    }

PHP:

I would greatly appreciate any help.
Thanks

 

If I change the print _replacement($text); to:
print _replacement($obj->text, $text);
the replacement works, but the tag strip does not. It's one or the other. How do I make both work together?

 

Can anyone help me with this?