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<?php $a = []; $b = ["item_data"=>[1,2,3]]; $b = array_merge($a,$b); var_dump($b);
Output for git.master, git.master_jit, rfc.property-hooks
array(1) { ["item_data"]=> array(3) { [0]=> int(1) [1]=> int(2) [2]=> int(3) } }

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