Good Afternoon, I think its better to use HTML form properties, you want to validate the entered values, so its easy to do it like this: 1- 'Make' should not be empty:
<input type="text" name="make" size="40" required/>
2- 'Year' and 'Mileage' must be numeric:
<input type="number" name="year" size="40"/>
<input type="number" name="mileage" size="40"/>
by this way you dont need to write any php validation for your form, if you want to use php validation let me know to guide you for solving your problem
when Submit button press then first you have to Check Submit Button Post like this:
if(isset($_POST['submit'])){
//Your Code Logic...
}
then get data from POST & store it in variable like this... for Your Reference
if(isset($_POST['submit'])){
$username = $_POST['username'];
$password = $_POST['password'];
}
in html...
<body>
<form method="post" action="">
<input type="text" name="username" placeholder="enter username"><br/><br/>
<input type="text" name="password" placeholder="enter password"><br/><br/>
<input type="submit" name="submit" value="submit"/>
</form>
then store in database like this
$sql="insert into user(username, password)
values('$username','$password')";
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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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