Removing Brackets in PhP string

I was trying to pass a string with brackets through codeigniter URL and go an error of dissallowed characters. This is how i strip the brackets befort passing.

<?php

$cate=’Grade 3 (servere Hypertension)’;

$catttee=str_replace(array( ‘(‘, ‘)’ ), ”, $cate);

?>

Output=Grade 3 servere Hypertension

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