srtisrt doesn't work like this

function activitycheck($userid, $threadid, $threadtitle){
  global $L, $sql, $threshold, $thresholdmain, $thresholdacs;
  $activity=$sql->resultq("SELECT COUNT(*) FROM posts WHERE user=$userid AND thread=$threadid AND date>".(ctime()-86400));
  if($activity>=(stristr($threadtitle,'KCS ')?$thresholdacs:$thresholdmain+1) && (!has_perm('bypass-acs-limit') || !has_perm('no-restrictions')) && $threshold ){ // deary me
    print "$L[TBL1]>$L[TR1]>$L[TD1] style='text-align:center'>You have posted enough in the KCS thread today. Come back later!</td></tr>$L[TBLend]";
    die(pagefooter());
	}
  if(($activity>=$thresholdmain) && (!has_perm('bypass-main-limit') || !has_perm('no-restrictions')) && $threshold ){
    print "$L[TBL1]>$L[TR1]>$L[TD1] style='text-align:center'>You have posted enough in this thread today. Come back later!</td></tr>$L[TBLend]";
    die(pagefooter());
	}
  $activity=$sql->resultq("SELECT COUNT(*) FROM posts WHERE user=$userid AND date>".(ctime()-300));
	  if($activity && !has_perm('bypass-five-minutes')){
		 print "$L[TBL1]>$L[TR1]>$L[TD1]>You can only post once every five minutes! Make it count!</td></tr>$L[TBLend]";
		 die(pagefooter());
		 }