Name
isset
Synopsis
bool isset(mixedvalue1
)[, ... mixedvalueN
])
Returns true
if
value
, a variable, has been set; if the
variable has never been set or has been unset()
, the function returns false
. If multiple
values
are provided, then isset
will only return true
if they are all set.
Get Programming PHP, 3rd Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.