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<?php $gene_symbol = null; $variant_type = 'some'; var_dump(compact('gene_symbol', 'variant_type')); var_dump(compact('gene_symbol', null));
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { ["gene_symbol"]=> NULL ["variant_type"]=> string(4) "some" } Warning: compact(): Argument #2 must be string or array of strings, null given in /in/dfQPv on line 6 array(1) { ["gene_symbol"]=> NULL }

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