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<?php var_dump(explode('.', '08_05_2013_17_15_38-Mail an VN 25.04.2013.pdf'));
Output for 4.3.0 - 7.2.0
array(4) { [0]=> string(33) "08_05_2013_17_15_38-Mail an VN 25" [1]=> string(2) "04" [2]=> string(4) "2013" [3]=> string(3) "pdf" }