Operators are used to perform operations on variables and values. There are different groups of operators including arithmetic, assignment, comparison, increment/decrement, logical, string, and array operators. Assignment operators are used with numeric values to write a value to a variable, with the basic assignment operator being "=" which means the left operand gets set to the value of the right side expression.

2. WHAT ARE OPERATORS?
Operators are used to perform
operations on variables and
values.

3. GROUPS OF OPERATORS
• Arithmetic operators
• Assignment operators
• Comparison operators
• Increment/Decrement operators
• Logical operators
• String operators
• Array operators

4. ARITHMETIC OPERATORS

5. ASSIGNMENT OPERATORS

6. ASSIGNMENT OPERATORS
The PHP assignment operators are
used with numeric values to write
a value to a variable.
The basic assignment operator in
PHP is "=". It means that the left
operand gets set to the value of
the assignment expression on the
right.