arjunphp-blog

[arjunphp-blog]

Ruby: Create Zip files

In Ruby, you can use the zip library to create zip files. Here’s an example of how you can create a zip file containing multiple files: First, make sure you have the zip gem installed. You can install it via RubyGems: gem install rubyzip Now, here’s an example that demonstrates how to create a zip file containing multiple files: require 'zip' # Array of file paths to include in the…

[arjunphp-blog]

What is Redis and why is it used?

Redis is an open-source, in-memory data structure store used as a database, cache, and message broker. It’s known for its high performance, flexibility, and wide range of capabilities. Here’s a breakdown of its key features and why it’s used: Key Features: In-Memory Data Store: Redis primarily stores data in RAM, which allows for extremely fast read and write operations. Data Structures: It…

[arjunphp-blog]

PowerShell - If Else Statement

In PowerShell, the if statement is used for conditional execution. Here’s the basic structure of a if statement: Syntax Below is the syntax of an if…else if…else statement − if ( condition ) { commands_to_execute } [ elseif ( condition2 ) { commands_to_execute } ] [ else {commands_to_execute} ] If the boolean expression evaluates to true, then the block of code will be executed, otherwise,…

[arjunphp-blog]

Laravel - How to connect to azure sql server

To connect a Laravel application to an Azure SQL Server database, you’ll need to configure the database connection settings in your Laravel application. Here’s a step-by-step guide: Step 1: Install Necessary Dependencies Ensure you have the necessary database drivers installed. For Azure SQL Server, you’ll typically use the SQLSRV or PDO_SQLSRV drivers. You can install these using…

[arjunphp-blog]

Is SAN (subject alternative name) required for SSL certificate?

Subject Alternative Name (SAN) is an extension of the X.509 specification used in SSL/TLS certificates. SAN allows a single certificate to specify multiple domains, hostnames, or IP addresses to secure. Here’s why SAN is essential in SSL/TLS certificates: 1. Multi-Domain Support SAN allows a single certificate to secure multiple domain names or subdomains. This flexibility reduces the need for…

[arjunphp-blog]

Python split()

The split() method in Python is used to split a string into a list of substrings based on a delimiter. Here are multiple examples demonstrating its usage. Example 1: Splitting a String by Space sentence = "This is an example sentence." words = sentence.split() # Defaults to splitting by space print(words) # Output: ['This', 'is', 'an', 'example', 'sentence.'] Example 2: Splitting a String by…

[arjunphp-blog]

Difference between Const and Final in Dart

In Dart, final and const are both used to declare variables that cannot be reassigned once they are initialized. However, there are some differences between them Mutability final variables can only be assigned once. Their value can be set at runtime and is evaluated when assigned. const variables are implicitly final but are compile-time constants. They are constants at compile time, meaning…

[arjunphp-blog]

Elastic Kibana - Install as windows service

Creating a new Windows service for Kibana can be done using various methods. Here, I’ll provide steps using NSSM (Non-Sucking Service Manager), a commonly used tool to create services on Windows. Download NSSM: First, download NSSM from the official website: https://nssm.cc/download Extract the downloaded archive to a directory on your computer. Open PowerShell as Administrator: Right-click…

[arjunphp-blog]

Docker Multi-Stage Builds

Multi-stage builds in Docker allow you to create a Dockerfile with multiple build stages, enabling you to build and optimize your final image more efficiently. It’s particularly useful for reducing the size of the final image by separating the build environment from the runtime environment. Here’s an example of a Dockerfile utilizing multi-stage builds for a Node.js application using…

[arjunphp-blog]

Docker difference between copy and add

In Docker, both COPY and ADD are used to move files and directories from the host machine into the Docker container during the build process, but they have some differences Usage: COPY: It is used to copy files and directories from the host machine to the container. ADD: It has functionality similar to COPY, but it can also fetch remote URLs and extract TAR files. Complexity: COPY: Simple…

[arjunphp-blog]

Docker difference between cmd and entrypoint

In Docker, both CMD and ENTRYPOINT are instructions used in a Dockerfile to define how a container should run an application. However, they serve slightly different purposes CMD: This instruction specifies the default command to be executed when a container starts. It can be overridden by passing arguments to docker run. If a Dockerfile has multiple CMD instructions, only the last one will take…

[arjunphp-blog]

How to upgrade all Python packages with pip

You can upgrade all installed Python packages using pip by using the pip command with the --upgrade flag. Here’s the command to do that: Open a terminal or command prompt and enter: pip install --upgrade pip pip list --outdated --format=freeze | grep -v '^\-e' | cut -d = -f 1 | xargs -n1 pip install -U Let’s break down what this command does: pip install --upgrade pip: Upgrades pip itself to…

[arjunphp-blog]

How do I install pip on Windows?

Installing pip on Windows involves a few steps. If you have Python installed, pip might already be available. Here’s how you can check: Open a command prompt: Press Win + R, type cmd, and press Enter. Type python -m pip --version and press Enter. This command checks if pip is already installed. If you see version information, it means pip is installed. If not, follow these steps to install…

[arjunphp-blog]

What is a REST API?

In the digital landscape, communication between different software systems is crucial. This exchange of information occurs through Application Programming Interfaces (APIs). Among these, Representational State Transfer (REST) APIs stand out as a popular and widely used architectural style for designing networked applications. What is a REST API? REST, an acronym for Representational State…

[arjunphp-blog]

Mastering Error Handling and Debugging in Laravel Applications

Error handling and debugging are crucial aspects of any software development process. In Laravel, a robust framework, and understanding how to effectively handle errors and debug issues is essential for creating stable and reliable applications. Understanding Errors in Laravel Types of Errors: Overview of different types of errors encountered in Laravel (syntax errors, runtime errors, logic…

[arjunphp-blog]

Nginx Reverse Proxy For Flask Application.

To set up Nginx as a reverse proxy for a Flask application, you’ll need to configure Nginx to forward incoming requests to your Flask application’s server. Here’s a step-by-step guide to help you set up nginx reverse proxy for your Flask application. Install Nginx For Ubuntu/Debian: sudo apt-get install nginx For CentOS/RHEL: sudo yum install nginx Configure the Nginx server block Open the…

[arjunphp-blog]

PowerShell - What is [cmdletbinding()] and how does it work?

In PowerShell, the [CmdletBinding()] attribute is used to enable advanced parameter functionality for a function or script. When you add this attribute to your function or script, it enables a set of features commonly found in built-in cmdlets, providing consistent behavior and enhanced capabilities. Here’s how [CmdletBinding()] works and what it enables: Parameter declarations: The attribute…