Fatal error: Using $this when not in object context

Question

I got this error, i cant figure whats problem. My code is

class Example{
     public function get_lang()
        {
            $jezik = get_option('jezik');
                     switch ($jezik ) {
                         case $jezik == 'rs_RS':
                         $drzava = 'NazivSrb';
                         break;
                         case $jezik == 'ro_RO':
                         $drzava = 'NazivRo';
                         break;
                         case $jezik == 'uk_UK':
                         $drzava = 'NazivRu';
                         break;
                    }
            return $drzava;        
        }

    static public function ExecuteSql($where_criteria=NULL) {
            global $wpdb;

                   $drzva = $this->get_lang();

            $upit = "
                            SELECT ID, Naziv, $drzava, PhoneCode, Kod
                    FROM wp_drzava";
            if ($where_criteria)
                $upit .=" WHERE ". $where_criteria ;
            $upit .= " GROUP BY Kod";
            //echo $upit;
            return $wpdb->get_results($upit);
        }

{

Basically I try to use get_lang method return value, and save it to variable in other method, and pass it to query. But i get an error in this line

$drzva = $this->get_lang();

Girish · Accepted Answer · 2014-11-21 10:58:36Z

1

You can't use $this inside static method.. use self keyword if you want to use same class method inside static method

self::get_lang();

EDIT: get_lang() should static method, if you are not using class properties inside method.

edited Nov 21, 2014 at 10:58

answered Nov 21, 2014 at 10:47

Girish

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3 Comments

segarci Over a year ago

In this case, get_lang() should be static.

Girish Over a year ago

you can call non static method like self::callmethod while another method (get_lang()) not used $this inside method. static method is independent, you can call without create class object

Dimag Kharab Over a year ago

get_lang() static method is accessible via public ExecuteSql method, self:: will also work

RichardBernards · Accepted Answer · 2014-11-21 10:45:14Z

0

You cannot use $this in a static public function ($this does not exist in it).

To fix this, use:

$example = new Example;
$drzva = $example->get_lang();

answered Nov 21, 2014 at 10:45

RichardBernards

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