For example, we have our folder in /etc/nginx/sites-available/example.com And to make virtual symlink folder here /etc/nginx/sites-enabled we run this

sudo ln -s /etc/nginx/sites-available/example.com /etc/nginx/sites-enabled/

Three stages of using programming framework:

1. fascination with features and quick problem-solving

2. squeezing the maximum out of all configurations

3. difficulty in expanding the framework to new requirements

In result, throwing framework away and creating thing by yourself.

ls -Slh

-S will sort files by size
-l long listing
-h will make the output human-readable
-r will reverse the output

bash

mysql -e "show variables like 'datadir'"

mysql

show variables like 'datadir'

Memcache. It allows you to store both strings and php arrays and have fun. If it is not enough, try redis.

Edit file ~/.bash_aliases

nano ~/.bash_aliases

For example, I make alias a. So when I press a it will produce php artisan tinker Here file ~/.bash_aliases

alias a='php artisan tinker'

Load aliases immediately

source ~/.bash_aliases

Php isset will tell false if variable is null.

//false
isset($a[1]);

$a[1] = null;
//false
isset($a[1]);

That’s why you should use array_key_exists if you need to check if it is set or not.

//false
array_key_exists($a[1]);

$a[1] = null;
//true
array_key_exists($a[1]);