php man page for is_object

IS_OBJECT(3)								 1							      IS_OBJECT(3)

is_object - Finds whether a variable is an object

SYNOPSIS
       bool is_object (mixed  $var)

DESCRIPTION
	Finds whether the given variable is an object.

PARAMETERS
	      o $var
		- The variable being evaluated.

RETURN VALUES
	Returns TRUE if $var is an object, FALSE otherwise.

EXAMPLES
       Example #1

	      is_object(3) example

	      <?php
	      // Declare a simple function to return an
	      // array from our object
	      function get_students($obj)
	      {
		  if (!is_object($obj)) {
		      return false;
		  }

		  return $obj->students;
	      }

	      // Declare a new class instance and fill up
	      // some values
	      $obj = new stdClass();
	      $obj->students = array('Kalle', 'Ross', 'Felipe');

	      var_dump(get_students(null));
	      var_dump(get_students($obj));
	      ?>

NOTES
       Note

	       This function will return FALSE if used on an unserialized object where the class definition is not present (even though gettype(3)
	      returns object).

SEE ALSO
       is_bool(3), is_int(3), is_float(3), is_string(3), is_array(3).

PHP Documentation Group 													      IS_OBJECT(3)