Operator  Description  Example  Result 
+  Addition  a=1+2  3 
  Subtraction  a=31  2 
*  Multiplication  a=2*5  10 
/  Division  10/2  5 
%  Modulus (division remainder)  10%2  0 
++  Increment  a=3 a++  a=4 
  Decrement  a=3 a  a=2 
The comparison operators as shown below are used to compare two variables or expressions. The result of the comparison operation can be true or false.
Operator  Description  Example 
==  equal to  1==2 evaluated to false 
!=  not equal  1!=2 evaluated to true 
>  greater than  1>2 evaluated to false 
<  less than  1<2 evaluated to true 
>=  greater than or equal to  1>=2 evaluated to false 
<=  less than or equal to  1<=2 evaluated to true 
Operator  Description  Example 
&&  and  x=1 y=2 (x < 5 && y > 1) evaluated to true 
  or  x=1 y=2 (x>2  y>1) evaluated to true 
!  not  x=1 y=2 !(x==y) evaluated to true 
Each compound operator combines two operators together. For example a compound operator might combines the adding operator and the assignment operator.
Operator  Example  The Same As 
+=  x+=y  x=x+y 
=  x=y  x=xy 
*=  x*=y  x=x*y 
/=  x/=y  x=x/y 
.=  x.=y  x=x.y 
%=  x%=y  x=x%y 
In PHP, the point symbol (.) is used to concatenate strings.
Example:
$yourname="Yuk"."Sovandara";


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