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run code in 200+ php & hhvm versions
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<?php print_r(str_word_count(' one, two, three" four! five: six; ', 1));
based on UO8lU
Output for 4.3.0 - 7.2.0
Array ( [0] => one [1] => two [2] => three [3] => four [4] => five [5] => six )