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run code in 150+ php & hhvm versions
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<?php var_dump( setlocale( LC_ALL, 'en' ) ); var_dump( preg_match('/\s/u', "\xA0") );
Output for 5.3.4 - 7.1.0
bool(false) bool(false)
Output for 4.3.0 - 5.3.3
bool(false) int(0)