php ref variable handling

Function

Description

boolval()

Returns the boolean value of a variable

debug_zval_dump()

Dumps a string representation of an internal zend value to output

doubleval()

Alias of floatval()

empty()

Checks whether a variable is empty

floatval()

Returns the float value of a variable

get_defined_vars()

Returns all defined variables, as an array

get_resource_type()

Returns the type of a resource

gettype()

Returns the type of a variable

intval()

Returns the integer value of a variable

is_array()

Checks whether a variable is an array

is_bool()

Checks whether a variable is a boolean

is_callable()

Checks whether the contents of a variable can be called as a function

is_countable()

Checks whether the contents of a variable is a countable value

is_double()

Alias of is_float()

is_float()

Checks whether a variable is of type float

is_int()

Checks whether a variable is of type integer

is_integer()

Alias of is_int()

is_iterable()

Checks whether the contents of a variable is an iterable value

is_long()

Alias of is_int()

is_null()

Checks whether a variable is NULL

is_numeric()

Checks whether a variable is a number or a numeric string

is_object()

Checks whether a variable is an object

is_real()

Alias of is_float()

is_resource()

Checks whether a variable is a resource

is_scalar()

Checks whether a variable is a scalar

is_string()

Checks whether a variable is of type string

isset()

Checks whether a variable is set (declared and not NULL)

print_r()

Prints the information about a variable in a human-readable way

serialize()

Converts a storable representation of a value

settype()

Converts a variable to a specific type

strval()

Returns the string value of a variable

unserialize()

Converts serialized data back into actual data

unset()

Unsets a variable

var_dump()

Dumps information about one or more variables

var_export()

Returns structured information (valid PHP code) about a variable