PHP Singleton Class - Fatal error: Call to private MyObject::__construct() -

singleton class:

<?php  class db_singleton {     const oracle_host = "someip";     const oracle_user = "validuser";     const oracle_pass = "validpass";     const oracle_db = "someip/dbname";      private static $instance; // stores oci_* instance      private function __construct() { } // block directly instantiating      private function __clone() { } // block cloning of object       public static function call()     {          // create instance if not exist         if(!isset(self::$instance))         {             // oracle_* constants should set or             //  replaced db connection details             self::$instance = oci_connect(self::oracle_user, self::oracle_pass, self::oracle_db);             if(self::$instance->connect_error)             {                   throw new exception('oracle connection failed: ' . self::$instance->connect_error);             }         }         // return instance         return self::$instance;     }           public function __destruct() {         oci_close($instance);     }      public function queryresult($query)     {              $result_set_array =array();             $this->stmt = oci_parse($this->con, $query);             oci_execute($this->stmt);              while($row=oci_fetch_array($this->stmt,oci_assoc+oci_return_nulls))             {                  $result_set_array[] = $row;             }             oci_free_statement($this->stmt);             return $result_set_array;      } } ?> 

when try using singleton class below code, works perfect , fetch results.

$conn = db_singleton::call(); $stid = oci_parse($conn, 'select * somevalid_table'); oci_execute($stid);  while($result=oci_fetch_array($stid,oci_assoc+oci_return_nulls))   {     $result_set_array[] = $result;  } 

now, when try extending class using model, throws exception

class myclass extends db_singleton{  public function somemodel()     {          $result = parent::queryresult(" select * somevalid_table");         return $result;     }    } 

exception:

 fatal error: call private db_singleton::__construct() context 'somecontroller' 

i know class cannot instantiated having private constructor. __construct() functions called when object instantiated, trying $x = new myobject() cause fatal error private construction function.

i using singleton classes prevent direct instantiation of object. how can overcome issue ? best solution ?

thanks.

$x = new myobject() never work if constructor private in class because __construct() first method invoked on object creation.

create public method /**  * singleton class  *  */ final class userfactory {     /**      * call method singleton      *      * @return userfactory      */     public static function instance()     {         static $inst = null;         if ($inst === null) {             $inst = new userfactory();         }         return $inst;     }      /**      * private ctor nobody else can instance      *      */     private function __construct()     {      } } 

to use:

$fact = userfactory::instance(); $fact2 = userfactory::instance();  $fact == $fact2; 

but:

$fact = new userfactory()