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run code in 200+ php & hhvm versions
Bugs & Features
<?php var_dump(number_format('20wefew'));
Output for 5.3.0 - 7.2.0
Notice: A non well formed numeric value encountered in /in/dEiRf on line 3 string(2) "20"
Output for 4.3.0 - 5.2.17
string(2) "20"