Variable handling Functions

boolval — Get the boolean value of a variable
debug_zval_dump — Dumps a string representation of an internal zval structure to output
doubleval — Alias of floatval
empty — Determine whether a variable is empty
floatval — Get float value of a variable
get_debug_type — Gets the type name of a variable in a way that is suitable for debugging
get_defined_vars — Returns an array of all defined variables
get_resource_id — Returns an integer identifier for the given resource
get_resource_type — Returns the resource type
gettype — Get the type of a variable
intval — Get the integer value of a variable
is_array — Finds whether a variable is an array
is_bool — Finds out whether a variable is a boolean
is_callable — Verify that a value can be called as a function from the current scope.
is_countable — Verify that the contents of a variable is a countable value
is_double — Alias of is_float
is_float — Finds whether the type of a variable is float
is_int — Find whether the type of a variable is integer
is_integer — Alias of is_int
is_iterable — Verify that the contents of a variable is an iterable value
is_long — Alias of is_int
is_null — Finds whether a variable is null
is_numeric — Finds whether a variable is a number or a numeric string
is_object — Finds whether a variable is an object
is_real — Alias of is_float
is_resource — Finds whether a variable is a resource
is_scalar — Finds whether a variable is a scalar
is_string — Find whether the type of a variable is string
isset — Determine if a variable is declared and is different than null
print_r — Prints human-readable information about a variable
serialize — Generates a storable representation of a value
settype — Set the type of a variable
strval — Get string value of a variable
unserialize — Creates a PHP value from a stored representation
unset — Unset a given variable
var_dump — Dumps information about a variable
var_export — Outputs or returns a parsable string representation of a variable