Return new collection without modifying original collection

php laravel-5 collections eloquent

PHP Snippet 1:

$original = collect([1, 2, 3, 4, 5]);

$modified = $original->map(function ($el) {
     return $el * 2; 
});

dd($modified);

PHP Snippet 2:

=> Illuminate\Support\Collection {#3726
     all: [
       2,
       4,
       6,
       8,
       10,
     ],
   }

PHP Snippet 3:

dd($original);

PHP Snippet 4:

=> Illuminate\Support\Collection {#3743
     all: [
       1,
       2,
       3,
       4,
       5,
     ],
   }