Forem: Shoaib Akbar

Filtering and Customizing Arrays in PHP: A Step-by-Step Guide

Shoaib Akbar — Sun, 15 Oct 2023 11:47:36 +0000

We'll explore how to filter an array of books to display only those written by a specific author or by relaeseYear.

Array I'll use in examples

$books = [ [ 'name' => 'Do Androids Dream of Electric Sheep', 'author' => 'Philip K. Dick', 'releaseYear' => 1968, 'purchaseURL' => 'http://example.com' ], [ 'name' => 'Project Hail Mary', 'author' => 'Andy Weir', 'releaseYear' => 2021, 'purchaseURL' => 'http://example.com' ], [ 'name' => 'The Martian', 'author' => 'Andy Weir', 'releaseYear' => 2011, 'purchaseURL' => 'http://example.com' ] ];

We'll start with a basic foreach loop.

foreach($books as $book) {

    if($book['author'] === "Andy Weir") {
        echo "<a href='#'><li>". $book['name'] ."</li></a>";
    }
}

Creating a Filter Function by Author and releaseYear

function filterByAuthor($books) {

    $filteredBooks = [];

    foreach($books as $book){

        if($book['author'] === "Andy Weir") {
            $filteredBooks[] = $book; 
        }

    }

    return $filteredBooks;

}

function filterByReleaseYear($books) {

    $filteredBooks = [];

    foreach($books as $book){

        if($book['releaseYear'] === 2011) {
            $filteredBooks[] = $book; 
        }

    }

    return $filteredBooks;

}

?>

    <ul>

        <?php 

            foreach(filterByAuthor($books) as $book) {

                echo "<a href='#'><li>". $book['name'] ."</li></a>";

            }

        ?>

    </ul>

Creating a Generalized Filter Function to add more flexibility

function filter($items, $key, $value) {

    $filteredItems = [];

    foreach($items as $item){

        if($item[$key] === $value) {
            $filteredItems[] = $item; 
        }

    }

    return $filteredItems;

}

$filterByAuthor = filter($books, 'author', 'Andy Weir');
$filteredByReleaseYear = filter($books, 'releaseYear', 2011);

?>

    <ul>

        <?php 

            foreach($filterByAuthor as $book) {

                echo "<a href='#'><li>". $book['name'] ."</li></a>";

            }

        ?>

    </ul>

Using Anonymous Functions for Filtering to add even more flexibility to the conditional statement


function filter($items, $fn) {

    $filteredItems = [];

    foreach($items as $item){

        if($fn($item)) {
            $filteredItems[] = $item; 
        }

    }

    return $filteredItems;

}

$filterByAuthor = filter($books, function($book){

    return $book['author'] === 'Andy Weir';

});

$filteredByReleaseYear = filter($books, function($book){
    return $book['releaseYear'] >= 2000;
});

?>

    <ul>

        <?php foreach($filterByAuthor as $book) : ?>

                <a href='#'><li> <?= $book['name']; ?> </li></a>

            <?php endforeach; ?>

    </ul>    

    <ul>

        <?php foreach($filteredByReleaseYear as $book) : ?>

                <a href='#'><li> <?= $book['name']; ?> </li></a>

            <?php endforeach; ?>

    </ul>

PHP build-in array_filter() solves this exactly!

$filterByAuthor = array_filter($books, function($book){

    return $book['author'] === 'Andy Weir';

});

$filteredByReleaseYear = array_filter($books, function($book){
    return $book['releaseYear'] >= 1950;
});

?>

    <ul>

        <?php foreach($filterByAuthor as $book) : ?>

                <a href='#'><li> <?= $book['name']; ?> </li></a>

            <?php endforeach; ?>

    </ul>    

    <ul>

        <?php foreach($filteredByReleaseYear as $book) : ?>

                <a href='#'><li> <?= $book['name']; ?> </li></a>

            <?php endforeach; ?>

    </ul>

How I Remove Productivity Blockers ?

Shoaib Akbar — Thu, 03 Sep 2020 06:51:26 +0000

Hello everyone,
I am hustling for consistent productivity. I used many techniques and got magical results but I found 2 main blockers which are related to each other, Today I am looking for suggestions and techniques to resolve them.

Blocker 1:
I do plan for daily tasks, split into small tasks, add todo time for each small task and I got done 90% of work according to plan. And then I leave them incomplete. I noted sometime I waste same/double time to finish that 10% remaining stuff.

Blocker 2:
After 2 months of work from home, I felt, I started making delay in actions, I wait for actions. And someday I successfully waste either first-half or second-half of day without doing anything.

Note: It's not in everyday routine. It's a few days in a month.

I talked with my friends. They tried to convinced me it's story of everyone.

What do you say ?

Writing Functions (Uncle Bob's principles)

Shoaib Akbar — Tue, 07 Jul 2020 05:58:32 +0000

Some principles to write functions from Clean Code book

The first rule of functions is that they should be small.
The second rule of functions is that they should be smaller
than that (upto 20 lines of code)
FUNCTIONS SHOULD DO ONE THING
Function Arguments

Better if no argument
Functions should have maximum of 2 arguments
But arguments should not be exceeded by 3
(They take a lot of conceptual power)
It should has same level of abstraction
(1 level of abstraction)
Passing a boolean into a function is a truly terrible
practice. (Flag as argument)

Keep Learning!!

What I learnt in one year of my code review

Shoaib Akbar — Sat, 13 Jun 2020 11:25:53 +0000

In first few months I got much comments on my code after code review. Later on I started building that mindset. It help me a lot,

Let me share with you few techniques

Mindset (start building that mindset).
Use Exceptions handling, read error messages, log errors.
Try test your core logic, all possible ways (write multiple inputs, don't test your code on same input again and again).
Figure out break points. And print messages on all breakpoints.
Believe that you are human and you have made errors. start finding out them.
Start testing your code at the beginning(line by line).
Also Take break, have some coffee and let your logic run in background of your mind, and then get back.
In all this you need a lot of patience.

Keep Learning!!

Due to Coronovirus (COVID19) TCP applications are being converted to UDP to avoid Handshakes..!!

Shoaib Akbar — Thu, 12 Mar 2020 16:19:36 +0000

Due to Coronovirus (COVID19) applications are being converted to UDP to avoid Handshakes..!! This kind of jokes we are reading on social media.

Let's try to understand it.

Coronovirus

How anyone can be effected with this virus ???? Simply by accepting it from others.

How TCP Works

TCP is how most of the web works. It's a web page like blog page sending and receiving data. It's 2 way protocol, there's handshake involved.
You request for data and that request is recognized and you get back data package.
So it's 2 way communication.

How UDP Works

UDP is opposite of TCP. It's like there's stream of data you are accepting without recognizing like live streaming. You are just accepting accepting accepting......

This is how it relates with Coronovirus.

What's New In Codeigniter4 Installation

Shoaib Akbar — Wed, 11 Mar 2020 09:19:00 +0000

Codeigniter4 is rewrite of framework and has lot of differences compared to previous version. Lets see what's new in codeigniter4 installation instructions.

Codeigniter3 Installation

Codeigniter3 offers only Manual Installation in 4 steps.

1.Download and unzip package
2.Upload CI folder and files on server
3.In application/config/config.php file set base URL.
4.For database use, set settings in application/config/database.php file. If you want to use encryption or sessions, set encryption key.

Codeigniter4 Installation

Codeigniter4 offers 3 ways of installations.

1.Manually Installation
2.Composer Installation
3.Git Installation

I'll write in detail about composer and git installations in coming posts.

Keep Learning!!

Codeigniter4 Requirements

Shoaib Akbar — Tue, 10 Mar 2020 13:19:20 +0000

Codeigniter4 is officially launched with major changes on 24.02.2020

Codeigniter4 Server Requirements

Codeigniter now requires PHP 7.2 or newer version

Extensions

Codeigniter4 requires php-json, php-mbstring, php-mysqlnd, php-xml extensions installed on server.

Libraries

To use CURLRequest, libcurl should be installed.

One Difference Between Smart and Professional Programmer

Shoaib Akbar — Mon, 24 Feb 2020 12:10:29 +0000

Programmers are pretty smart people.

Smart Programmer

Smart people sometimes like to show off their smarts by demonstrating their mental juggling abilities.
if you can reliably remember you can write similar code.

for (int j=0; j<34; j++) { s += (t[j]*4)/5; }

Professional Programmer

A professional programmer understands that clarity is king. Professionals use their powers for good and write code that others can understand.
int realDaysPerIdealDay = 4; const int WORK_DAYS_PER_WEEK = 5; int sum = 0; for (int j=0; j < NUMBER_OF_TASKS; j++) { int realTaskDays = taskEstimate[j] * realDaysPerIdealDay; int realTaskWeeks = (realdays / WORK_DAYS_PER_WEEK); sum += realTaskWeeks; }

Write readable and understandable code.

i couldn't add indentation, if you know please write in comment.

Keep Learning!

Setup vagrant on Linux/Ubuntu

Shoaib Akbar — Sun, 23 Feb 2020 02:26:44 +0000

A complete guide to setup vagrant on Ubuntu 18.04

Install VirtualBox

Start by importing GPG keys of the Oracle Virtualbox repository:

`wget -q https://www.virtualbox.org/download/oracle_vbox_2016.asc -O- | sudo apt-key add -`

`wget -q https://www.virtualbox.org/download/oracle_vbox.asc -O- | sudo apt-key add -`

Both commands should output OK which means that keys are successfully imported and packages from this repository are trusted.

Next add virtual box APT repository:

`sudo add-apt-repository "deb [arch=amd64] http://download.virtualbox.org/virtualbox/debian $(lsb_release -cs) contrib"`

$(lsb_release -cs) will print the Ubuntu codename. For example, if you have Ubuntu version 18.04 the command will print bionic.

If you get an error message saying add-apt-repository command not found then you need to install the software-properties-common package.

Once the Virtualbox repository is enabled, update the apt package list and install the latest version of Virtualbox:

`sudo apt update`

`sudo apt install virtualbox-6.0`

Now Virtualbox is installed on your Ubuntu system, start:

`virtualbox`

Installing Vagrant

update package list:

`sudo apt update`

Download the Vagrant package:

`curl -O https://releases.hashicorp.com/vagrant/2.2.6/vagrant_2.2.6_x86_64.deb`

NOTE
if curl is not installed :

`sudo apt install curl`

Now try to download the Vagrant package again

Once the .deb file is downloaded, install it:

`sudo apt install ./vagrant_2.2.6_x86_64.deb`

Verify Vagrant installation:

`vagrant --version`

The output should be similar to

Vagrant 2.2.6

Getting Started with Vagrant

Now Vagrant is installed on your Ubuntu system let's create a development environment.
The first step is to create root directory for project which will contain Vagrantfile file. Vagrantfile is a Ruby file that contain configurations and provision the virtual machine.

`mkdir ~/my-first-vagrant-project`

`cd ~/my-first-vagrant-project`

Next initialize a new Vagrantfile (will create vagrant file):

`vagrant init`

and specify the box you want to use.

(You can search other boxes on this link https://app.vagrantup.com/boxes/search we’ll use ubuntu/trusty64)

'vagrant init ubuntu/trusty64`

Now create and configure the virtual machine as specified in the Vagrantfile:

`vagrant up`

Next update changes in Vagrantfile:

`vagrant provision`

Next reload vagrant and virtual box:

`vagrant reload`

To ssh into the virtual machine:

`vagrant ssh`

Can stop the virtual machine:

`vagrant halt`

Can destroys all resources(be careful):

Forem: Shoaib Akbar

Filtering and Customizing Arrays in PHP: A Step-by-Step Guide

How I Remove Productivity Blockers ?

Writing Functions (Uncle Bob's principles)

What I learnt in one year of my code review

Due to Coronovirus (COVID19) TCP applications are being converted to UDP to avoid Handshakes..!!

What's New In Codeigniter4 Installation

Codeigniter4 Requirements

One Difference Between Smart and Professional Programmer

Setup vagrant on Linux/Ubuntu

wget -q https://www.virtualbox.org/download/oracle_vbox_2016.asc -O- | sudo apt-key add -

wget -q https://www.virtualbox.org/download/oracle_vbox.asc -O- | sudo apt-key add -

sudo add-apt-repository "deb [arch=amd64] http://download.virtualbox.org/virtualbox/debian $(lsb_release -cs) contrib"

sudo apt update

sudo apt install virtualbox-6.0

virtualbox

sudo apt update

curl -O https://releases.hashicorp.com/vagrant/2.2.6/vagrant_2.2.6_x86_64.deb

sudo apt install curl

sudo apt install ./vagrant_2.2.6_x86_64.deb

vagrant --version

Vagrant 2.2.6

mkdir ~/my-first-vagrant-project

cd ~/my-first-vagrant-project

vagrant init

'vagrant init ubuntu/trusty64`

vagrant up

vagrant provision

vagrant reload

vagrant ssh

vagrant halt

vagrant destroy

Keep Learning!

`wget -q https://www.virtualbox.org/download/oracle_vbox_2016.asc -O- | sudo apt-key add -`

`wget -q https://www.virtualbox.org/download/oracle_vbox.asc -O- | sudo apt-key add -`

`sudo add-apt-repository "deb [arch=amd64] http://download.virtualbox.org/virtualbox/debian $(lsb_release -cs) contrib"`

`sudo apt update`

`sudo apt install virtualbox-6.0`

`virtualbox`

`sudo apt update`

`curl -O https://releases.hashicorp.com/vagrant/2.2.6/vagrant_2.2.6_x86_64.deb`

`sudo apt install curl`

`sudo apt install ./vagrant_2.2.6_x86_64.deb`

`vagrant --version`

`mkdir ~/my-first-vagrant-project`

`cd ~/my-first-vagrant-project`

`vagrant init`

`vagrant up`

`vagrant provision`

`vagrant reload`

`vagrant ssh`

`vagrant halt`

`vagrant destroy`