PHP: Fastest way to handle undefined array key

Question

in a very tight loop I need to access tenthousands of values in an array containing millions of elements. The key can be undefinied: In that case it shall be legal to return

Answer 1

This Work for me

{{ isset($array['key']) ? $array['key']: 'Default' }} 

but this is fast

{{ $array['key'] or 'Default' }}