(PHP 4, PHP 5, PHP 7)
is_numeric — 锟斤拷锟斤拷锟斤拷锟角凤拷为锟斤拷锟街伙拷锟斤拷锟斤拷锟街凤拷锟斤拷
锟斤拷锟� var 锟斤拷锟斤拷锟街猴拷锟斤拷锟斤拷锟街凤拷锟斤拷锟津返伙拷 TRUE锟斤拷锟斤拷锟津返伙拷 FALSE锟斤拷
锟轿硷拷 is_bool()锟斤拷is_float()锟斤拷is_int()锟斤拷is_string()锟斤拷is_object()锟斤拷is_array() 锟斤拷 is_integer()锟斤拷