pick 2nd word from right side (Like – ADMINISTRATOR). and if 2nd word character less then 5 then add character from (“LGRNH”). in php

$str = "BFEBFBFF0001067A-00AC1AC2-TOBEFILLEDBYOEM-ADMINISTRATOR-STE"; 
 if( str_ends_with($Machineid,'-STE')) {
        // echo " Saral Typing Exam";
        $s_plans = substr($Machineid,5,-5);
        echo "n";
        echo $s_plans;

pick 2nd word from right side (Like – ADMINISTRATOR). and if 2nd word character less then 5 then add character from (“LGRNH”). in php .