LeonSkrilec

memory_get_peak_usage();

function formatBytes($bytes, $precision = 2) {
    $units = array("b", "kb", "mb", "gb", "tb");

    $bytes = max($bytes, 0);
    $pow = floor(($bytes ? log($bytes) : 0) / log(1024));
    $pow = min($pow, count($units) - 1);

    $bytes /= (1 << (10 * $pow));

LeonSkrilec

MySQL

Getting started:

• http://www.sqlteaching.com/
• https://www.codecademy.com/courses/learn-sql

Related tutorials:

• MySQL-CLI
• Analyzing Business Metrics

LeonSkrilec

How to create working self signed certificate for custom virtual hosts on Windows

Step by step tutorial how to create working self signed SSL certificate for XAMPP apache server on Windows (Even working in chrome version > 58)

Prerequisites

You have to have OpenSSL installed and in your system PATH for this to be working.

You can download OpenSSL binary here. Just extract contents in some directory - I put mine in C:/OpenSSL