Maybe I’m missing something, but in your first print_r($articles), the global variable $articles is in the scope of the getArticles() function, so we’re all good there. But, in your second print_r($articles), which is happening after the closing brace of the getArticles() function declaration, $articles has not been globalized. So, it’s just set to the empty array.
Doing a global $articles prior to your second print_r($articles) should give you the results.
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