empty | PHP 3.0
bool empty(mixed var) |
Determines whether a variable is empty.

floatval | PHP 4.1.0
float floatval(mixed var) |
Gets the float value of a variable.

get_defined_vars | PHP 4.0.4
array get_defined_vars(void) |
Returns an associative array of names and values of all currently defined variable names (variables in the current scope).

get_resource_type | PHP 4.0.2
string get_resource_type(resource res) |
Gets the resource type name for a given resource.

gettype | PHP 3.0
string gettype(mixed var) |
Returns the type of the variable.

import_request_variables | PHP 4.1.0
bool import_request_variables(string types[, string prefix]) |
Imports GET/POST/Cookie variables into the global scope.

intval | PHP 3.0
int intval(mixed var[, int base]) |
Gets the integer value of a variable using the optional base for the conversion.

is_array | PHP 3.0
bool is_array(mixed var) |
Returns true if the variable is an array.

is_bool | PHP 4.0
bool is_bool(mixed var) |
Returns true if variable is a boolean.

is_callable | PHP 4.0.6
bool is_callable(mixed var[, bool syntax_only[, string callable_name]]) |
Returns true if variable is callable.

is_float | PHP 3.0
bool is_float(mixed var) |
Returns true if variable is float point.

is_long | PHP 3.0
bool is_long(mixed var) |
Returns true if variable is a long (integer).

is_null | PHP 4.0.4
bool is_null(mixed var) |
Returns true if variable is NULL.

is_numeric | PHP 4.0
bool is_numeric(mixed value) |
Returns true if value is a number or a numeric string.

is_object | PHP 3.0
bool is_object(mixed var) |
Returns true if variable is an object.

is_resource | PHP 4.0
bool is_resource(mixed var) |
Returns true if variable is a resource.

is_scalar | PHP 4.0.5
bool is_scalar(mixed value) |
Returns true if value is a scalar.

is_string | PHP 3.0
bool is_string(mixed var) |
Returns true if variable is a string.

isset | PHP 3.0
bool isset(mixed var[, mixed var[, ...]]) |
Determines whether a variable is set.

print_r | PHP 4.0
bool print_r(mixed var[, bool return]) |
Prints out or returns information about the specified variable.

serialize | PHP 3.0.5
string serialize(mixed variable) |
Returns a string representation of variable (that can later be unserialized).

settype | PHP 3.0
bool settype(mixed var, string type) |
Sets the type of the variable.

strval | PHP 3.0
string strval(mixed var) |
Gets the string value of a variable.

unserialize | PHP 3.0.5
mixed unserialize(string variable_representation) |
Takes a string representation of variable and recreates it.

unset | PHP 3.0
void unset(mixed var[, mixed var[, ...]]) |
Unsets a given variable.

var_dump | PHP 3.0.5
void var_dump(mixed var) |
Dumps a string representation of a variable to output.

var_export | PHP 4.1.0
mixed var_export(mixed var[, bool return]) |
Outputs or returns a string representation of a variable.