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<?php $pivot = array_fill(0, 1, ['is_primary' => false]); $groups = array_combine(['customer'], $pivot); var_dump($pivot); var_dump($groups);
Output for git.master, git.master_jit, rfc.property-hooks
array(1) { [0]=> array(1) { ["is_primary"]=> bool(false) } } array(1) { ["customer"]=> array(1) { ["is_primary"]=> bool(false) } }

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