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<?php $headers1 = [ 'content-type' => ['application/foo'], '-1' => ['custom'], ]; $headers2 = [ 'content-type' => ['application/bar'], '-1' => ['override'], ]; var_dump($headers1); var_dump(array_merge($headers1, $headers2));
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { ["content-type"]=> array(1) { [0]=> string(15) "application/foo" } [-1]=> array(1) { [0]=> string(6) "custom" } } array(3) { ["content-type"]=> array(1) { [0]=> string(15) "application/bar" } [0]=> array(1) { [0]=> string(6) "custom" } [1]=> array(1) { [0]=> string(8) "override" } }

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