Online PHP editor | output for B9fNc

<?php $temp = '-k'; $v='j'; $neg_t = strpos($temp,'-')?TRUE:FALSE; $neg_v = strpos($v,'-')?TRUE:FALSE; $temp = substr($temp, -1); $v = substr($v, -1); switch($temp) { case '0': $temp = $v; break; case '1': switch($v) { case '1':$temp = '1'; break; case 'i':$temp = 'i'; break; case 'j':$temp = 'j'; break; case 'k':$temp = 'k'; break; } break; case 'i': switch($v) { case '1':$temp = 'i'; break; case 'i':$temp = '-1'; break; case 'j':$temp = 'k'; break; case 'k':$temp = '-j'; break; } break; case 'j': switch($v) { case '1':$temp = 'j'; break; case 'i':$temp = '-k'; break; case 'j':$temp = '-1'; break; case 'k':$temp = 'i'; break; } break; case 'k': switch($v) { case '1':$temp = 'k'; break; case 'i':$temp = 'j'; break; case 'j':$temp = '-i'; break; case 'k':$temp = '-1'; break; } break; } if($neg_t xor $neg_v) { $temp = '-' . $temp; } echo $temp;