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<?php $array1 = [ ['id_cat' => 1, 'title_cat' => 2], ['id_cat' => 3, 'title_cat' => 4] ]; $array2 = [ ['id_prod' => 1, 'title_prod' => 2], ['id_prod' => 3, 'title_prod' => 4] ]; foreach($array1 as $key => $value) { $result[$key] = array_merge($array1[$key], $array2[$key]); } echo json_encode($result);
Output for git.master, git.master_jit, rfc.property-hooks
[{"id_cat":1,"title_cat":2,"id_prod":1,"title_prod":2},{"id_cat":3,"title_cat":4,"id_prod":3,"title_prod":4}]

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