<?php
$str = <<<str
<td width="551">
<p><strong>Full Time Faculty<br>
<strong></strong>Assistant Professor</strong></p>Doctorate of Business Administration<br><br>
<strong>Phone</strong>: +88 01756567676<br>
<strong>Email</strong>: frank.wade@email.com<br>
<strong>Office</strong>: NAC739<br>
<br><p><b>Curriculum Vitae</b></p></td>
str;
// We explode $str and use '</strong>' as delimiter and get only the part of result that we need
$lines = array_slice(explode('</strong>', $str), 3, 3);
// Define a function to remove extra text from left and right of our so called lines
function stripLine($line) {
// ltrim ' ;' characters and remove everything after (and including) '<br>'
return preg_replace('/<br>.*/is', '', ltrim($line, ' :'));
}
$lines = array_map('stripLine', $lines);
print_r($lines);