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run code in 150+ php & hhvm versions
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<?php //echo 'locale: ' . setlocale(LC_ALL, 0) . PHP_EOL; echo preg_replace('/./u', '<$0>', 'and рублей').PHP_EOL;
Output for 4.3.10 - 4.4.9, 5.0.2 - 7.1.0
<a><n><d>< ><р><у><б><л><е><й>
Output for 4.3.0 - 4.3.9, 5.0.0 - 5.0.1
Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/omPcF on line 3 <a><n><d>< ><р><у><б><л><е><й>PHP_EOL