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<?php $keywords = [['keyword'=>'designing'],['keyword'=>'logo designing']]; $user_id = 5; array_walk($keywords, fn(&$v, $k, $u) => $v = ['user_id' => $u] + $v, $user_id); var_export($keywords);
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => array ( 'user_id' => 5, 'keyword' => 'designing', ), 1 => array ( 'user_id' => 5, 'keyword' => 'logo designing', ), )

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