PHP; Call to undefined function - Recursive

[v0ld3m0rt1s]

Here's my code;

function kontrol1($source)
        {
            if(strstr($source, 'www.bulurum.com\'u kullanmaya devam etmek için lütfen robot olmadığınızı doğrulayınız.')){
                sleep(120);
                $source = siteSourceCode(["url" => $url."?Order=AtoZ"]);
                kontrol($source);
            }
        }

Here's my problem;

 

I'm trying to define a global function like this. But its stucking when call itself. Its not a class so i can't use "$this->". How can i make it work ?

 

Thanks in Advance.

[v0ld3m0rt1s]

What a stupid i am.

 

I noticed my mistake after i post this.

 

im trying to call "kontrol()" instead of "kontrol1()"