Laravel php artisan commands hits memory error on every local project after runs a do while loop

I was testing one of my do while loop function and hits an error.
So i terminated php artisan serve command and reload my php and apache on my mac. But after that when i try to php artisan serve and other php artisan xxx commands on my project, it hits the problem below.

xxx-MacBook-Pro:xxxx xxxx$ php artisan serve
PHP Fatal error:  Allowed memory size of 2097152 bytes exhausted (tried to allocate 36864 bytes)

I have tried to set my php.ini memory_limit to 1GB or -1, and restart php and apache but the problem still occurs. This problem also occurs when i try to run serve command on my other laravel projects and running composer install.

Has anyone met the same problem before and how do you solve it?

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