PHP Variable Handling Functions

Function Description
boolval() get the Boolean value of a variable
debug_zval_dump() Dumps the string representation of an internal zend value to output
doubleval() Alias of floatval
empty() Determine wheter a variable is empty
floatval() Get float value of a variable
get_defined_vars() Returns an array of all defined variables
get_resource_type() Returns the resource type
gettype() Get the type of a variable
import_request_variables() Import GET/POST/Cookie variables into the global scope
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 the contents of a variable can be called as a function
is_double() Alias of is_float
is_float() Finds whether the type of a variable is float
is_int() Fine whether the type of a variable is integer
is_integer() Alias of is_int
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() Finds whether the type of a variable is string
isset() Determine if a variable is set and is not 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 strings representation of a variable

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