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run code in 200+ php & hhvm versions
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<?php $cena = '5.5'; echo sprintf("%01.2f", preg_replace(array("/ /", "/,/"), array("", "."), $cena));
Output for 5.6.30, hhvm-3.15.4 - 3.22.0, 7.0.0 - 7.3.0rc3
5.50