in operator in laravel code example

Example 1: ?? ' ' operator in php laravel

// Null Coalesce Operator in PHP (Laravel) - $statement ?? ''
$categoryName = $category->name ?? 'Not Available';

// The above Statement is identical to this if/else statement
if (isset($category->name)) {
    $categoryName = $category->name;
} else {
    $categoryName  = 'Not Available';
}

Example 2: laravel chunk select

DB::table('users')->chunk(100, function($users)
{
    foreach ($users as $user)
    {
        //
    }
});