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This article explains how to convert a Hashmap to a JSON object in Java. We will see a detailed example of creating a hashmap and then converting it to a JSON object. Hashmap and JSON are both very commonly used by developers as they help u...

This tutorial explains how to create program delays in Java and gives some sample code to understand it. There are several ways to create a time delay, such as TimeUnit.sleep() ,, ScheduleAtFixedRate() etc. Thread.sleep() Let's look at an e...

This article explains how to use enum in Java . We will use statement switch with enum in two ways . switch In Java, we use traditional switch and case to perform enumeration operations. switch In this example, we SwitchEnum create an enume...

This tutorial explains how to filter elements from a DataFrame based on multiple conditions. We will use the following DataFrame in this article. import pandas as pd stocks_df = pd . DataFrame( { "Stock" : [ "Tesla" , "Moderna Inc" , "Faceb...

HTTP headers carry data between web servers and browsers for communication. Whenever we enter a URL in the address bar of our browser, it sends an HTTP request to the server; it contains a header. In PHP use get_headers() get the headers fo...

This tutorial will discuss different ways to check for numeric characters in PHP. We will use regular expressions and built-in functions in PHP. The functions we will use are ctype_digit , preg_match , , strpos , is_numeric and filter_var ....

This article will cover different ways to format numbers as dollar amounts in PHP with examples. These include: number_format NumberFormatter::formatCurrency Regular expressions Manual format We'll also look at why money_format the function...

There are many ways to encode images into base64 format using several built-in functions in PHP. These functions include: pathinfo file_get_contents base64_encode mime_content_type Encode images to Base64 in PHP using file_get_contents , pa...

$_SERVER['HTTP_REFERER'] Provides us with a referrer URL to determine the user request on the server. However, this is not a best practice because the referrer can be HTTP compromised through . $_SESSION[] Determine the referrer in PHP usin...

curl This article will show you how to use Requests in PHP to set PHP_AUTH_USER and PHP_AUTH_PW and use Requests through the command line curl . It will also show you how to confirm that the values ​​of PHP_AUTH_USER and PHP_AUTH_PW hav...

Multithreading is a form of program execution in which a single process creates multiple threads and they execute simultaneously. This tutorial will discuss multithreading in PHP and show you how to implement it. Parallel Implementing multi...

phpinfo() is a built-in function in PHP which outputs all the information of PHP configuration on the local host. We have to phpinfo() create a PHP file with a simple function call. Sometimes, the file may not work properly and output a 404...

This article shows the steps to update the PHP version from 7.x version to 7.4 in CentOS. How to Update PHP from 7.X to 7.4 in CentOS Update operating system packages. yum update -y Check your PHP version in CentOS. php -v Prints a list of...

PHP has one of the best encryption functions for data security. Hash_hmac() The encrypt function is one of the most famous encryptors. We'll show you how to use hash_hmac and sha256 encryptors to create 安全签名 one that you can store i...

We can upload images in PHP using simple file upload operation, but first, php.ini file upload should be enabled from Files. This tutorial demonstrates how to upload images in PHP. php.ini Enable file upload from file in PHP to upload image...