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<?php $pivot = array_fill(0, 2, ['is_primary' => false]); $groups = array_combine(['customer','xx'], $pivot); var_dump($pivot); var_dump($groups);
Output for 5.6.30, hhvm-3.15.4 - 3.22.0, 7.0.0 - 7.3.1
array(2) { [0]=> array(1) { ["is_primary"]=> bool(false) } [1]=> array(1) { ["is_primary"]=> bool(false) } } array(2) { ["customer"]=> array(1) { ["is_primary"]=> bool(false) } ["xx"]=> array(1) { ["is_primary"]=> bool(false) } }