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run code in 200+ php & hhvm versions
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<?php $gene_symbol = null; $variant_type = 'some'; var_dump(compact('gene_symbol', 'variant_type')); var_dump(compact('variant_type', null));
based on dfQPv
Output for 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.30 - 7.3.0rc3
array(2) { ["gene_symbol"]=> NULL ["variant_type"]=> string(4) "some" } array(1) { ["variant_type"]=> string(4) "some" }