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<?php $mainArr = '[ {"name":"Saqib1", "id":"1"}, {"name":"Saqib2", "id":"2"}, {"name":"Saqib3", "id":"3"}, {"name":"Saqib4", "id":"4"}, {"name":"Saqib5", "id":"5"}, {"name":"Saqib6", "id":"6"}, {"name":"Saqib7", "id":"7"}, {"name":"Saqib8", "id":"8"}, {"name":"Saqib9", "id":"9"}, {"name":"Saqib10", "id":"10"} ]'; // Initial array of objects $newObject = new stdClass(); // The new object you want to add $newObject->name = 'New'; $newObject->id = '11'; $newObject->extraKey = 'this is extra key for newObjects to identify'; $n = 3; // The number of indexes after which to add the new object $decoded = json_decode($mainArr); var_dump($decoded); for ($i = 0; $i < count($decoded); $i++) { if (($i + 1) % $n == 0) { array_splice($decoded, $i, 0, $newObject); } } var_dump($decoded);