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<?php var_dump( explode( ' ', preg_replace( '#\s+#', ' ', 'Aleksandr Mesilane Aleksandr' ) ) );
Output for 4.3.0 - 7.1.0
array(3) { [0]=> string(9) "Aleksandr" [1]=> string(8) "Mesilane" [2]=> string(9) "Aleksandr" }