ursuleacv

<?php
function quadraticRegression($dataPoints) {
    $sumX = 0;
    $sumX2 = 0;
    $sumX3 = 0;
    $sumX4 = 0;
    $sumY = 0;
    $sumXY = 0;
    $sumX2Y = 0;
    

ursuleacv

<?php
function polyfit($dependentValues, $independentValues, $countOfElements, $order, &$coefficients)
{
    // Declarations...
    // ----------------------------------
    $maxOrder = 5;
    
    $B = array_fill(0, $maxOrder + 1, 0.0);
    $P = array_fill(0, (2 * ($maxOrder + 1)) + 1, 0.0);
    $A = array_fill(0, (2 * ($maxOrder + 1)) * ($maxOrder + 1), 0.0);

ursuleacv

name: '[PROJECT NAME]'
'on':
    push:
        branches:
            - master
            - develop
            - 'releases/**'
    pull_request: null
env:
    working_directory: ./application

ursuleacv

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

ursuleacv

user web;

# One worker process per CPU core.
worker_processes 8;

# Also set
# /etc/security/limits.conf
#   web soft nofile 65535
#   web hard nofile 65535
# /etc/default/nginx

ursuleacv

<select name="timezone" id="timezone">
    <option>
        Africa/Abidjan
    </option> <option>
        Africa/Accra
    </option> <option>
        Africa/Addis_Ababa
    </option> <option>
        Africa/Algiers
    </option> <option>

ursuleacv

Alternate way to find php-fpm size in human readable format.
ps -eo size,pid,user,command --sort -size | awk '{ hr=$1/1024 ; printf("%13.2f Mb ",hr) } { for ( x=4 ; x<=NF ; x++ ) { printf("%s ",$x) } print "" }' | grep php-fpm

pm.max_children = Total RAM dedicated to the web server / MAXIMUM child process size - in my case it was 85MB

The server has 8GB of RAM, so:

pm.max_children = 6144MB / 85MB = 72

ursuleacv

https://www.owasp.org/index.php/SCG_WS_nginx#SSL_Module

https://github.com/denji/nginx-tuning

https://gist.github.com/plentz/6737338

https://gist.github.com/denji/8359866

ursuleacv

yum clean all
yum update

if doesn't work than 

rpm --rebuilddb
yum update

ursuleacv

composer dump-autoload
php artisan clear-compiled
php artisan config:cache
php artisan optimize --force