Settings API – save an array of options as one setting (array_push?)

Always develop with WP_DEBUG set to TRUE. You’ve a typo:

array_push($valid_input[$id], $input[$id];

(missing ) after the array_push)

You can’t push to arrays that are not … arrays.

// So, check this before pushing: 
$valid_input[$id] = ! is_array( $valid_input[$id] ) ? (array) $valid_input[$id] : $valid_input[$id];

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