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<?php var_dump(mb_substitute_character(0));
based on LRWV0
Output for 8.0.0 - 8.0.3
bool(true)
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.28, 7.4.0 - 7.4.13
Warning: mb_substitute_character(): Unknown character in /in/FqOFj on line 3 bool(false)