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<?php var_dump(preg_split('#\n+#', "abc:def\r\naf:\n\n"));
based on jdsCT
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
array(3) { [0]=> string(8) "abc:def " [1]=> string(3) "af:" [2]=> string(0) "" }