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I need a list of post tags, only the tags present in the posts shown in a paged front page. So, my first step is to build an array with this tags. This is what I did:

1. Declare an array in the global scope (front-page template)

$filtros = array();

2. Inside loop, get the tags of each post and add it to the array

$posttags = get_the_tags();
if ($posttags) {
  foreach($posttags as $tag) {
    if( !in_array( $tag->name ,$filtros ) ) {
      array_push($filtros, $tag->name);
    }
  }
}

I have two questions:

1. If array was declared, why return this warning?

 Warning: array_push() expects parameter 1 to be array, null given.

2. Once I have the array working, how can I update the tag list?

I mean, the tag list must be present in the header, before the loop, but the tag array was built after the loop. Can I update the tag list rendered before the loop with an array built after the loop?

Thank you in advance.

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$filtros = array(); will always returns null, meaning it's an empty array.

To make your code works, you can try :

   $filtros[] = $tag->name;

instead of array_push(),

Hope it works after!

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