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run code in 150+ php & hhvm versions
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<?php mb_internal_encoding('UTF-8'); $value = 'g' . chr(0xa4) .'eld'; var_dump(mb_substitute_character('entity'), mb_convert_encoding($value, 'UTF-8'), mb_substitute_character()); var_dump(mb_substitute_character('long'), mb_convert_encoding($value, 'UTF-8'), mb_substitute_character()); var_dump(mb_substitute_character(0x3013), mb_convert_encoding($value, 'UTF-8'), mb_substitute_character()); var_dump(mb_substitute_character('none'), mb_convert_encoding($value, 'UTF-8'), mb_substitute_character());
Output for 5.4.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
bool(true) string(5) "g?eld" string(6) "entity" bool(true) string(10) "gBAD+A4eld" string(4) "long" bool(true) string(7) "g〓eld" int(12307) bool(true) string(4) "geld" string(4) "none"
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.2.5 - 5.3.29
bool(true) string(4) "geld" string(6) "entity" bool(true) string(4) "geld" string(4) "long" bool(true) string(4) "geld" int(12307) bool(true) string(4) "geld" string(4) "none"
Output for 4.3.2 - 5.2.4
Warning: mb_substitute_character(): Unknown character. in /in/ng7Qh on line 7 bool(false) string(4) "geld" int(63) bool(true) string(4) "geld" string(4) "long" bool(true) string(4) "geld" int(12307) bool(true) string(4) "geld" string(4) "none"
Output for 4.3.0 - 4.3.1
Warning: mb_substitute_character() [http://www.php.net/function.mb-substitute-character]: Unknown character. in /in/ng7Qh on line 7 bool(false) string(4) "geld" int(63) bool(true) string(4) "geld" string(4) "long" bool(true) string(4) "geld" int(12307) bool(true) string(4) "geld" string(4) "none"