@ AlejandroSk: Nothing bad with that line, you should re-view your code.
PS:
PHP Code:
if (!equal(item, "weapon_", 7) && !equal(item, "ammo_", 5) && !equal(item, "item_", 5) && !equal(item, "tf_weapon_", 10))
return 0
Some code is useless there, adapt the function to your need.