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run code in 150+ php & hhvm versions
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<?php var_dump(implode('', range('a', 'z')) . implode('', range('A', 'Z')) . implode('', range(0, 9)));
Output for 4.3.0 - 7.1.0
string(62) "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"