Problems with onwall

[Starfire2001]

The following script is part of a weapon, that when fired pushes any player in front of the player who fired the weapon a certain distance depending on how far away they are. Everything is working fine except for detecting a wall and stopping the player from going through it when they are hit. In this script I made it so my chat would say "onwall" if its detecting that the player is onwall and "good" if they are not, but regardless of where I fire the weapon wall present or not my chat always shows as "onwall", which leads me to believe I had no idea how to use onwall, but I haven't been able to find anything to help me with it. So yeah, as always, any help/advice would be greatly appreciated.

PHP Code:

function onActionServerSide(this.face, this.firex, this.firey){
  for (temp.pl: players){
    if (player.communityname != pl.communityname){
      // Attack came from the bottom
      if (face == 0){
        if(pl.y in | firey - 2, firey -.1 |) {
          if(pl.x in | firex - 1, firex + 1 |) {
            pl.hearts = 0;
          }
        }
        if(pl.y in | firey - 3, firey - 2.1 |) {
          if(pl.x in | firex - 1.5, firex + 1.5 |) {
            temp.strength = 12;
            for (strength = 12; strength > 0; strength --){
              sleep (.05);
              pl.y = pl.y - .5;
              if (onwall(pl.x,pl.y-1.5)){
                player.chat = "onwall";
              }
              else{
                player.chat = "good";
              }
            }
          }
        }
      }
      if(pl.y in | firey - 4, firey - 3.1 |) {
        if(pl.x in | firex - 2, firex + 2 |) {
          temp.strength = 8;
          for (strength = 8; strength > 0; strength --){
            sleep (.05);
            pl.y = pl.y - .5;
            if (onwall(pl.x,pl.y-1.5)){
              player.chat = "onwall";
            }
            else{
              player.chat = "good";
            }
          }
        }
      }
      if(pl.y in | firey - 5, firey - 4.1 |) {
        if(pl.x in | firex - 2.5, firex + 2.5 |) {
          temp.strength = 4;
          for (strength = 4; strength > 0; strength --){
            sleep (.05);
            pl.y = pl.y - .5;
            if (onwall(pl.x,pl.y-1.5)){
              player.chat = "onwall";
            }
            else{
              player.chat = "good";
            }
          }
        }
      }
    }
  }
}