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Try out just checked
<input type="radio" id="drone" name="drone" value="drone" checked>
Else clause in echo is redundant. Checkout this code:
<Input type="radio" name="vyber_tb" class="prepinac cursorPointer" value="<?php echo $db_hod;?>" <?php if($nazov_db == $db_hod) echo 'checked';?>>
Always follow standards. Use either single or double quotes(I recommend double quotes for HTML and single quotes for PHP) for HTML and PHP, and follow it throughout your code. Look how much readable is the above code compared to your code.
In standard HTMLchecked is a standalone attribute which could be used with<input type="checkbox"> and<input type="radio">. Though browsers support all these variations of checked:
checked
checked = "true"
checked = "checked"
only the first one is recommended by W3C. Source: W3C
Also theautocomplete attribute works with the following types: text, search, url, tel, email, password, datepickers, range, and color.
Source: W3C
Also whenever possible use single quotes (') with php. Using 'Single quoted' strings is more efficient as the contents of the string displayed "as is". Variables and escape sequences except\\ will not be interpreted. Which makes them lot more efficient than "Double quoted" strings.
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PHP (from the English Hypertext Preprocessor - hypertext preprocessor) is a scripting programming language for developing web applications. Supported by most hosting providers, it is one of the most popular tools for creating dynamic websites.
The PHP scripting language has gained wide popularity due to its processing speed, simplicity, cross-platform, functionality and distribution of source codes under its own license.
https://www.php.net/
HTML (English "hyper text markup language" - hypertext markup language) is a special markup language that is used to create sites on the Internet.
Browsers understand html perfectly and can interpret it in an understandable way. In general, any page on the site is html-code, which the browser translates into a user-friendly form. By the way, the code of any page is available to everyone.
https://www.w3.org/html/
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