3v4l.org

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<?php $array = array("Item1.10", "Item2.5", "Item3.0", "Item2.2", "Item4.50", "Item2.50"); $tempArray = array(); $newArray = array(); foreach($array as $value) { $item = explode(".", $value); if(!in_array($item[0], $tempArray)) { $newArray[] = $value; $tempArray[] = $item; } } print_r($newArray);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Array ( [0] => Item1.10 [1] => Item2.5 [2] => Item3.0 [3] => Item2.2 [4] => Item4.50 [5] => Item2.50 )

preferences:
287.83 ms | 406 KiB | 455 Q