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Operators are symbols or special characters in PHP that allow you to perform operations, such as arithmetic calculations or logical comparisons, on variables and values. There are various types of operators available in PHP, including arithmetic, assignment, comparison, logical, and string operators.

Here are some examples of how these operators are used:

1. Arithmetic Operators:
- Addition (+): Adds two operands together.
Example: $result = $num1 + $num2;
- Subtraction (-): Subtracts the second operand from the first.
Example: $result = $num1 - $num2;
- Multiplication (*): Multiplies two operands.
Example: $result = $num1 * $num2;
- Division (/): Divides the first operand by the second.
Example: $result = $num1 / $num2;
- Modulus (%): Returns the remainder of the division operation.
Example: $result = $num1 % $num2;

2. Assignment Operators:
- Assignment (=): Assigns a value to a variable.
Example: $num = 10;
- Compound assignment (+=, -=, *=, /=, %=): Performs an operation and assigns the result to the variable.
Example: $num += 5; // Adds 5 to the current value of $num

3. Comparison Operators:
- Equal to (==): Checks if two values are equal.
Example: if ($num1 == $num2) { // do something }
- Not equal to (!=): Checks if two values are not equal.
Example: if ($num1 != $num2) { // do something }
- Greater than (>), Less than (<), Greater than or equal to (>=), Less than or equal to (<=): Perform respective comparisons.
Example: if ($num1 > $num2) { // do something }

4. Logical Operators:
- AND (&&): Returns true if both operands are true.
Example: if ($x > 0 && $y < 10) { // do something }
- OR (||): Returns true if either of the operands is true.
Example: if ($x > 0 || $y < 0) { // do something }
- NOT (!): Reverses the logical state of an operand.
Example: if (!$flag) { // do something }

5. String Operators:
- Concatenation (.): Joins two strings together.
Example: $fullName = $firstName . " " . $lastName;

These are just a few examples of the operators available in PHP. They provide a way to manipulate and compare values, perform calculations, and make logical decisions within your PHP code.