Once you have a few variables you can make operations with them:
$base = 20; $height = 10; $area = $base * $height;
* I used to multiply $base per $height is the multiplication operator.
We have quite a few operators, let’s do a quick roundup of the main ones.
To start with, here are the arithmetic operators:
% (remainder) and
We have the assignment operator
=, which we already used to assign a value to a variable.
Next up we have comparison operators, like
>=. Those work like they do in math.
2 < 1; //false 1 <= 1; // true 1 <= 2; // true
== returns true if the two operands are equal.
=== returns true if the two operands are identical.
What’s the difference?
You’ll find it with experience, but for example
1 == '1'; //true 1 === '1'; //false
We also have
!= to detect if operands are not equal:
1 != 1; //false 1 != '1'; //false 1 != 2; //true //hint: <> works in the same way as !=, 1 <> 1
!== to detect if operands are not identical:
1 !== 1; //false 1 !== '1'; //true
Logical operators work with boolean values:
// Logical AND with && or "and" true && true; //true true && false; //false false && true; //false false && false; //false true and true; //true true and false; //false false and true; //false false and false; //false // Logical OR with || or "or" true || true; // true true || false //true false || true //true false || false //false true or true; // true true or false //true false or true //true false or false //false // Logical XOR (one of the two is true, but not both) true xor true; // false true xor false //true false xor true //true false xor false //false
We also have the not operator:
$test = true !$test //false
I used the boolean values
false here, but in practice you’ll use expressions that evaluate to either true or false, for example:
1 > 2 || 2 > 1; //true 1 !== 2 && 2 > 2; //false
All of the operators listed above are binary, meaning they involve 2 operands.
PHP also has 2 unary operators:
$age = 20; $age++; //age is now 21 $age--; //age is now 20
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