Reading some php code, you might get confused about the difference betweeen =, ==, and === (this single, double, and triple equal signs). Here's a quick summary.

= (Assignment) Just like in (pretty much) every other programming language.

== (Equality) Returns true if the two variables have the same value.

=== (Identity) Returns true if the two variables have the same value AND the same type (integer 0 is not equal to, in the === sense, float 0 or string 0).

Hope that clears up confusion. It did for me.

[Source: Wellho.net]