Operators are catalysts of operations. In other words operators are signs that perform a special operation. For example + operator is used for adding values. PHP has many operators to perform different operations. Some of the operators are:
+ addition
– subtraction
* multiplication
/ division
% modulus or remainder
= assignment
== comparison
!= not equals
. concatenation/Combination
&& logical AND
|| logical OR
XOR logical xor
< less than
> greater than
<= less than, equal to
>= greater than, equal to
Click here to read about PHP constants.