⚡ Special Operators in PHP

Special Operators in PHP provide unique functionality beyond standard arithmetic or comparison operators. They allow developers to streamline conditional logic, manage default fallback values, evaluate object inheritance, and control output execution efficiently.

PHP includes several specialized operators for advanced data handling:

1️⃣ Ternary Operator (? :): Shorthand syntax for inline if-else conditions.
2️⃣ Null Coalescing Operator (??): Returns the first operand if it exists and is not null; otherwise returns the fallback value.
3️⃣ Spaceship Operator (<=>): Used for three-way comparison (returns -1, 0, or 1).
4️⃣ Type Operator (instanceof): Checks if an object belongs to a specific class or interface.
5️⃣ Execution Operator (` `): Executes shell commands via backticks.
6️⃣ Error Control Operator (@): Suppresses error diagnostics generated by an expression.

1️⃣ Ternary Operator (? :) & Null Coalescing (??)
Ideal for evaluating conditions quickly and setting safe fallback defaults for unassigned variables.

// Ternary Operator
$age = 20;
$status = ($age >= 18) ? "Adult" : "Minor";
echo $status; // Outputs: Adult

// Null Coalescing Operator
$username = $_GET['user'] ?? 'Guest';
echo $username; // Outputs 'Guest' if $_GET['user'] is null or not set

2️⃣ Spaceship Operator (<=>)
Compares two expressions and returns -1 when less, 0 when equal, and 1 when greater. Highly effective inside custom sorting functions.

echo 5 <=> 10; // Outputs: -1 (5 is smaller)
echo 10 <=> 10; // Outputs:  0 (values are equal)
echo 10 <=> 5;  // Outputs:  1 (10 is greater)

3️⃣ Type Operator (instanceof)
Verifies whether an instantiated object is an instance of a specified class or inherits from a parent interface.

class User {}
class Admin extends User {}

$admin = new Admin();

var_dump($admin instanceof Admin); // Returns: bool(true)
var_dump($admin instanceof User);  // Returns: bool(true)