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35 minutes ago, pswork said:

{if isset($sections) && $sections}
  {foreach from=$sections key=keySection item='section'}
    {if isset($section.hook) && $section.hook === $hook}
    {/if}
  {/foreach}
{/if}

do i need to check every time isset($section.hook) if it is a child already checked isset($sections)?

The best practice is to do this. Unless your 100% sure that if $sections is set de sub variables are always filled.

If a variable is called which is not set a error will be displayed.