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run code in 150+ php & hhvm versions
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<?php $keywords = preg_split("/[\s,]+/", "hypertext language, programming"); var_dump($keywords);
Output for 4.3.0 - 7.1.0
array(3) { [0]=> string(9) "hypertext" [1]=> string(8) "language" [2]=> string(11) "programming" }