Allowed memory size of 1073741824 bytes exhausted (tried to allocate 534777856 bytes) in laravel code example

Example 1: increase memory laravel controller

ini_set('memory_limit', '64M');

Example 2: Allowed memory size of 1610612736 bytes exhausted (tried to allocate 4096 bytes) laravel

1. Firstly i find which php.ini is working because i was using multiple xampp,
  so using : php --ini
2. after that in that file i updated the memory_limit = -1