=== and !===

PHP is a loosly typed language.  For instance this is true because PHP converts to the requried types before the compare:

  if (1000 == "+1000")

To perform an exact comparison you can use this instead, which is false

  if (1000 === "+1000")

For does not equal you can also use

!==

Break

To exit out of nested loop you can use break #; where # is the number of loops you want to exit;