About ini_set('memory_limit', '-1');

I try to using ini_set('memory_limit', '-1'); and I don't know to where coding

ini_set('memory_limit', '-1'); where file to write.

thank you.

I try to using ini_set('memory_limit', '-1'); and I don't know to where coding

ini_set('memory_limit', '-1'); where file to write.

thank you.

Maybe in index.php, after <?php tag
Also you can put this code into ENVIRONMENT 
For example index.php :

PHP Code:

switch (ENVIRONMENT)
{
    case 'development':
                ini_set('memory_limit', '-1');
        error_reporting(-1);
        ini_set('display_errors', 1);
    break; 


Please remember that in a shared hosting environment setting the memory_limit might not work as hosting providers could overrule your settings.

But if you develop localy or host your project on you own server or a vps it is be possible to set the memory limit by numbers of ways: inside your php.ini configuration file, a htaccess file or inside your own .php script file.