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<?php $a = array( '123' => array(1) ); $b = array( '123' => array(2, 3) ); foreach ($b as $k => $v) { $a[$k] = array_merge($a[$k] ?? [], $v); } var_export($a);
Output for git.master_jit, git.master, rfc.property-hooks
array ( 123 => array ( 0 => 1, 1 => 2, 2 => 3, ), )

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