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this is my code I try to resolve this issue but not able to do, Kindly help me to do :

First one is database connection code ; which i connected with my file home.php

<code><?php

$db_host="localhost";

$db_user="root";

$db_pass="";

$db_name="connection";

//create connection

$conn = mysqli_connect($db_host, $db_user, $db_pass, $db_name);

// check connection

if( !$conn){

die("connection failed: ".mysqli_connect_error());

}

// checking submit button process or not

if (isset($_REQUEST['submit'])) {

//checking for empty fields

if (($_REQUEST['name']=="" || $_REQUEST['password']="")) {

echo "fill all the fields";

}

else{

//insert data invariable

$name = $_REQUEST['name'];

$mail = $_REQUEST['mail'];

$password = $_REQUEST['password'];

$sql = "INSERT INTO user (name, password, mail) VALUES ('$name', '$mail', '$password')";

//check data is inserted or not

if (mysqli_query($conn, $sql)) {

echo "data inserted";

}

else{

echo "data not inserted";

}

?>

</code>

<?php
$db_host="localhost";
$db_user="root";
$db_pass="";
$db_name="connection";

//create connection

$conn = mysqli_connect($db_host, $db_user, $db_pass, $db_name);

// check connection

if( !$conn){
    die("connection failed: ".mysqli_connect_error());
}

// checking submit button process or not

if (isset($_REQUEST['submit'])) {
    //checking for empty fields
    if (($_REQUEST['name']=="" || $_REQUEST['password']="")) {
        echo "fill all the fields";
    }
    else{
        //insert data invariable
        $name = $_REQUEST['name'];
        $mail = $_REQUEST['mail'];
        $password = $_REQUEST['password'];
        $sql = "INSERT INTO user (name, password, mail) VALUES ('$name', '$mail', '$password')";
        //check data is inserted or not
        if (mysqli_query($conn, $sql)) {
            echo "data inserted";
        }
        else{
            echo "data not inserted";
        }
    }
}
?>

<head>

<style>

form{

border: 2px skyblue solid;

width: auto;

text-align: center;

}

</style>

</head>

<body>

<h1>API Testing</h1>

</form>

</body>

</html>

</code>

<code><!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>API</title> <style> form{ border: 2px skyblue solid; width: auto; text-align: center; } </style> </head> <body> <h1>API Testing</h1> <br><br> <form action="POST" action="connection.php"> <h2>FORM</h2> <input type="text" name="name" placeholder="enter your Name"><br><br> <input type="text" name="mail" placeholder="enter your Email"><br><br> <input type="password" name="password" placeholder="enter your Password"><br><br> <input type="submit" value="submit" name="submit"> </form> </body> </html> </code>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>API</title>
    <style>
        form{
            border: 2px skyblue solid;
            width: auto;
            text-align: center;
        }
    </style>
</head>
<body>
    <h1>API Testing</h1>
    <br><br>
    <form action="POST" action="connection.php">
        <h2>FORM</h2>
        <input type="text" name="name" placeholder="enter your Name"><br><br>
        <input type="text" name="mail" placeholder="enter your Email"><br><br>
        <input type="password" name="password" placeholder="enter your Password"><br><br>
        <input type="submit" value="submit" name="submit">
    </form> 
</body>
</html>

this is my code where i made a form and here connection is the file name of database connection of file with PHP

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how to resolve database connection of PHP error of localhost PORT 80