(PHP 4, PHP 5, PHP 7)
is_string — 锟斤拷锟斤拷锟斤拷锟角凤拷锟斤拷锟街凤拷锟斤拷
$var
锟斤拷锟� var 锟斤拷 string 锟津返伙拷 TRUE锟斤拷锟斤拷锟津返伙拷 FALSE锟斤拷
var
TRUE
FALSE
锟轿硷拷 is_bool()锟斤拷is_int()锟斤拷is_integer()锟斤拷is_float()锟斤拷is_real()锟斤拷is_object() 锟斤拷 is_array()锟斤拷