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<?php var_dump(is_numeric('0xdeadbeef'), ctype_xdigit('0xdeadbeef'), is_numeric('deadbeef'));
Output for 7.0.0 - 7.2.0
bool(false) bool(false) bool(false)
Output for 4.3.0 - 5.6.28
bool(true) bool(false) bool(false)