Web Developer Notes - Page 2

At some point, I needed a way to display identical content blocks across multiple pages, with the ability to manage and update them easily from the WordPress admin panel. The simplest solution would be to use a standard HTML widget. However, this approach quickly becomes inconvenient, especially when you need something more structured or reusable. An ideal solution would be to use Advanced C...

WP Currency NBU - classic NBU (National Bank of Ukraine) exchange rate widget for WordPress. The widget displays the USD (US Dollar), EUR (Euro), PLN (Polish Zloty) exchange rate. You can configure the output of a particular currency independently through the admin panel. For example, if you do not need the output of the Polish zloty, you can hide it using the settings in the admin panel. The plug...

Longwave (LW) is a radio frequency band characterized by very low frequencies and extremely long wavelengths. Depending on the language and technical context, you may encounter different abbreviations: LW (Long Wave) — common English-language term LF (Low Frequency) — official ITU classification ДВ — Russian abbreviation (“Long Waves”) GO (Grandes Ondes) — French term In technical...

Сookie (web cookie or browser cookie) is a string of information that can be stored in a browser and sent to the server. The maximum size for one cookie is 4096 bytes. The number of cookies for one domain can be from 20 to 242, depending on the browser. Cookies are written as a string, but on a key-to-value basis. [js]document.cookie = "username=John Brown";[/js] Cookies may contai...

If you have the coordinates of two points on a map, calculating the distance between them is a fairly straightforward task. This type of calculation is commonly used in mapping applications, delivery services, navigation systems, and location-based features. In this example, we will focus on determining the distance using geographic coordinates such as latitude and longitude. These values allow us...