CMCDragonkai

Git Recipes

Bring in a Remote Branch

git fetch <remote>
git checkout -b <branch> --track <remote>/<branch>

CMCDragonkai

http://windows.php.net/downloads/pecl/releases/

CMCDragonkai

Python 2 and 3

When installing Python 2 and Python 3 on a Windows computer. The environment variables determine which one to use.

So one of the python executables may be on the PATH. You can rename the python executable such as python27.exe or python33.exe.

Then you can execute them like python27 or python33 on the CLI.

However when Python launches it utilises certain environment variables to get its dependencies.

CMCDragonkai

Build PHP with PHPBrew

WORK IN PROGRESS

http://devkardia.com/easyblog/ubuntu-12-04-multiple-php-versions-and-virtualmin-using-phpbrew.html

Use these php.ini files

- Make sure to use TCP sockets for everything. Unix Domain Sockets are BAAAAD!
- Set session save path to the temporary directory

CMCDragonkai

function sed-keyword-escape {
    echo $1 | sed -e 's/[]\/$*.^|[]/\\&/g'
} 

function sed-replace-escape {
    echo $1 | sed -e 's/[\/&]/\\&/g'
}

function sed-easy {
    sed -i "s/$(sed-keyword-escape $1)/$(sed-replace-escape $2)/g" $3

CMCDragonkai

<?php

// sorted array must be a 0 indexed
// left most index, right most index all inclusive
// finds all of the elements coming from the left to the right that is less or equal to the key
function bisect_right($sorted_array, $key, $left = null, $right = null){

    if(is_null($left)){
        reset($sorted_array);
        $left = key($sorted_array);

CMCDragonkai

<?php

// O(n) time complexity with constant space complexity
function fibonacci_dynamic($n){

    if($n == 0){
        return 0;
    }elseif($n == 1 OR $n == 2){
        return 1;
    }

CMCDragonkai

let
    fib = number: fib' number 1 1;
    fib' = number: first: second:
        if number == 0
        then first
        else fib' (number - 1) second (first + second);
        # the second becomes the new first, the (first + second) becomes the new second
in
    fib 5

CMCDragonkai

// factorial tail recursive (Elixir style)

// 4! means 1*2*3*4, we can ignore 1, which makes it 2*3*4 = 24

def factorial(number) do
    factorial(number, 1)
end

def factorial(number, product) do
    factorial(number - 1, product * number)

CMCDragonkai

<?php

// count inclusive from x to y keys (x and y keys are the keys for the prefix sum, not the keys of the original array)
function cumulative_slice($prefix, $x, $y){
    return $prefix[$y] - $prefix[$x];
}

// here's a more flexible function:
// run with X, Y when using original array indexes
// run with X, null, Z  when using cumulative array indexes