gettype(3) [php man page]

GETTYPE(3)								 1								GETTYPE(3)

gettype - Get the type of a variable

SYNOPSIS

       string gettype (mixed  $var)

DESCRIPTION

	Returns the type of the PHP variable $var. For type checking, use is_* functions.

PARAMETERS

	      o $var
		- The variable being type checked.

RETURN VALUES

	Possible values for the returned string are:

	      o "
		boolean"

	      o "
		integer"

	      o "
		double" (for historical reasons "double" is returned in case of a float, and not simply "float")

	      o "
		string"

	      o "
		array"

	      o "
		object"

	      o "
		resource"

	      o "
		NULL"

	      o "unknown type"

EXAMPLES

       Example #1

	      gettype(3) example

	      <?php

	      $data = array(1, 1., NULL, new stdClass, 'foo');

	      foreach ($data as $value) {
		  echo gettype($value), "
";
	      }

	      ?>

	      The above example will output something similar to:

	      integer
	      double
	      NULL
	      object
	      string

SEE ALSO

       settype(3),  get_class(3),  is_array(3),  is_bool(3),  is_callable(3),  is_float(3),  is_int(3),  is_null(3),  is_numeric(3), is_object(3),
       is_resource(3), is_scalar(3), is_string(3), function_exists(3), method_exists(3).

PHP Documentation Group 														GETTYPE(3)

IS_CALLABLE(3)								 1							    IS_CALLABLE(3)

is_callable - Verify that the contents of a variable can be called as a function

SYNOPSIS

       bool is_callable (callable  $name, [bool  $syntax_only = false], [string  &$callable_name])

DESCRIPTION

	Verify	that  the  contents  of a variable can be called as a function. This can check that a simple variable contains the name of a valid
       function, or that an array contains a properly encoded object and function name.

PARAMETERS

	      o $name
		- The callback function to check

	      o $syntax_only
		- If set to TRUE the function only verifies that $name might be a function or method. It will only reject  simple  variables  that
		are  not  strings,  or an array that does not have a valid structure to be used as a callback. The valid ones are supposed to have
		only 2 entries, the first of which is an object or a string, and the second a string.

	      o $callable_name
		- Receives the "callable name". In the example below it is "someClass::someMethod". Note, however, that  despite  the  implication
		that someClass::SomeMethod() is a callable static method, this is not the case.

RETURN VALUES

	Returns TRUE if $name is callable, FALSE otherwise.

EXAMPLES

       Example #1

	      is_callable(3) example

	      <?php
	      //  How to check a variable to see if it can be called
	      //  as a function.

	      //
	      //  Simple variable containing a function
	      //

	      function someFunction()
	      {
	      }

	      $functionVariable = 'someFunction';

	      var_dump(is_callable($functionVariable, false, $callable_name));	// bool(true)

	      echo $callable_name, "
";  // someFunction

	      //
	      //  Array containing a method
	      //

	      class someClass {

		function someMethod()
		{
		}

	      }

	      $anObject = new someClass();

	      $methodVariable = array($anObject, 'someMethod');

	      var_dump(is_callable($methodVariable, true, $callable_name));  //  bool(true)

	      echo $callable_name, "
";  //  someClass::someMethod

	      ?>

SEE ALSO

       function_exists(3), method_exists(3).

PHP Documentation Group 													    IS_CALLABLE(3)