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Variable Functions

CXVIII. Variable Functions

Introduction

For information on how variables behave, see the Variables entry in the Language Reference section of the manual.

Requirements

No external libraries are needed to build this extension.

Installation

There is no installation needed to use these functions; they are part of the PHP core.

Runtime Configuration

The behaviour of these functions is affected by settings in php.ini.

Table 1. Variables Configuration Options

NameDefaultChangeable
unserialize_callback_func""PHP_INI_ALL
For further details and definition of the PHP_INI_* constants see ini_set().

Here's a short explanation of the configuration directives.

unserialize_callback_func string

The unserialize() callback function will called (with the undefined class' name as parameter), if the unserializer finds an undefined class which should be instanciated. A warning appears if the specified function is not defined, or if the function doesn't include/implement the missing class. So only set this entry, if you really want to implement such a callback-function.

See also unserialize().

Resource Types

This extension has no resource types defined.

Predefined Constants

This extension has no constants defined.

Table of Contents
doubleval -- Alias of floatval()
empty -- Determine whether 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 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 a variable is a float
is_int -- Find whether a variable is an 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 a variable is a string
isset -- Determine whether a variable is set
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

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