Operators:
There is always use for math. If you're not a math person, no need to worry. We stick with easy math. So no calculus, trig, algreba, and so on.
We have 4 types of operators, and this goes for pretty much every other computer language out there.

Arithmetic Operators

Assignment Operators

Comparison Operators

Logical Operators
Arithemetic Operators:
Operator 
Name 
Examples 
Display 
+ 
Addition 
$x = 15;
echo $x + 5; 
20 
 
Subtraction 
$x = 15;
echo $x  10; 
5 
* 
Multiply 
$x = 15;
echo $x * 2; 
30 
/ 
Divide 
$x = 15;
echo $x / 5; 
3 
% 
Modulus 
$x = 15;
echo $x % 7; 
1 
++ 
Increment 
$x = 15;
echo $x++; 
16 
 
Decrement 
$x = 15;
echo $x; 
14 
Quick explanation of the last 3 rows:
the Modulus (%) is the remainder in a division. If you divide 15 by 7, you'll get 2 full parts, and 1 extra. That 1 extra is called the modulus.
the Increment (++) is very useful, especially in loops. It will add one to your variable.
the Decrement () is also useful. Exactly what you thought! Subtracts one from your variable.
Comparison Operators:
Operator 
Description 
Example 
Returns 
== 
Is equal to 
3==3
3==10 
true
false 
!= 
Is not equal 
5!=10
5!=5 
true
false 
<> 
Is not equal
(Same as !=) 
5<>10
5<>5 
true
false 
> 
Greater than 
10>1
10>100 
true
false 
>= 
Greater than or equal to 
10>=10
10>=12 
true
false 
< 
Less than 
10<100
10<1 
true
false 
<= 
Less than or equal to 
10<=10
10<=9 
true
false 
Logical Operators:
Operator 
Description 
Example 
Returns 
&& 
and 
$x = 5;
$y = 10;
$x>0 && $y<20 
true 
 
or 
$x = 5;
$y = 10;
$x ==5  $y ==10 
true 
! 
not 
$x = 5
$y = 10
!($x==$y) 
true 
These will make more sense when we get to if statements
Assignment Operators:
Operator 
Example 
Same as 
= 
$x = $y 
$x = $y 
+= 
$x += $y 
$x = $x + $y 
= 
$x = $y 
$x = $x  $y 
*= 
$x *= $y 
$x = $x * $y 
/= 
$x /= $y 
$x = $x / $y 
.= 
$x .= $y 
$x = $x . $y (like string concentation) 
%= 
$x %= $y 
$x = $x % $y 
Every operator can be put into a variable, changed, redeclared, and called (echo'd)
Remember:
When you get into large math formulars, the basic law of math: BEDMAS  Brackets, Exponents, Division/Multiplication, Addition/Subtraction
Your Task:
Create a new
php file called operators.php
Declare 2 integer variables. (Integers alone don't need quotes, remember)
Play with and figure out all the arithmetic operators and assignment operators.
Then make a sentence display with some text and one of your variables.
Don't worry about Logical or Comparison operators right now. By the end of this course, you'll be an operator proffessional!