- substr: documentation ( source)
- strrpos: documentation ( source)
<?php
$tdr="<p>Previous reports stated that the Pokemon Alpha.</p><p>On the other hand, Pokemon Diamond and Pearl are reported .</p><p>On the other hand, Pokemon Diamond and Pearl are reported.</p>";
$pos = strrpos($tdr, '<p>');
$newtdr = substr($tdr,0,$pos) . ' Hello <p>' . substr($tdr, $pos + 3);
echo $newtdr;