<?php
$str = '<span class="text">Lastly, <b>set up an Administrator Account</b> by entering the requested fields. If you wish to use Active Directory, enter the information of an Active Directory user.</span>';
printf (preg_replace('/<b>/', '', $str));
<span class="text">Lastly, set up an Administrator Account</b> by entering the requested fields. If you wish to use Active Directory, enter the information of an Active Directory user.</span>
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
<span class="text">Lastly, set up an Administrator Account</b> by entering the requested fields. If you wish to use Active Directory, enter the information of an Active Directory user.</span>