2
Use WHERE meta_key = 'ticker' OR meta_key = 'ticker2'
1
HTTP headers are different than the HTML head. The meta tag you're looking to add (for the Twitter card) is actually a meta tag that gets place in the HTML head.
So to achieve exactly what you're looking to do from a PHP "functions" file, you'd want to hook into wp_head instead. Like this:
add_action('wp_head', function(){
echo '<meta name=&...
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