Simplify Default Values with Null Coalescing Assignment (??=)

Replace verbose ternary checks and null coalescing reassignments with PHP null coalescing assignment operator (??=).

Setting default values on nullable variables often leads to repetitive variable references across statements.

PHP supports null coalescing assignment (`??=`) to combine evaluation and assignment into a single expression:

$username = null;

// Verbose ternary operator
$username = $username !== null ? $username : 'MrPunyapal';

// Null coalescing operator
$username = $username ?? 'MrPunyapal';

// Clean null coalescing assignment
$username ??= 'MrPunyapal';

• Only assigns the right-hand value if the left-hand variable is null
• Prevents repeating variable names on both sides of the assignment
• Reduces code clutter in configuration arrays and option initialization