   #PHP Manual Function Reference urlencode doubleval

   PHP Manual
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CVII. 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
   Name                      Default Changeable
   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 string representation of a variable
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