Front and rear side validation username Case (php, mysql combined)

html front end portion of the browser:

<html>
    <head>
        <meta charset='utf-8'/>
        <title>注册和登录</title>
    </head>
    <body>        
        <form action="http://10.36.150.38/0722/08register.php" method="get">
            <p>
                <label for="un">用户名:</label>
                <input type="text" name='username' id='un'>
            </p>
            <p>
                <label for="pd">密码：</label>
                <input type="text" name="password" id="pd">
            </p>
            <p>
                <input type="submit" value="注册">
            </p>
        </form>
    </body>
</html>

php code portion

? < PHP
     header ( 'Content-of the type: text / HTML; charset = UTF-8' );
     $ name = $ _REQUEST [ 'username']; // get the user name 
    $ pw = $ _REQUEST [ 'password']; / / obtain the password 
    // connect to the database: five parameters 
    $ SQL = mysqli_connect ( 'localhost', 'root', 'root', 'UserInfo', '3306' ); 
　　// mysqli_connect ( 'HTTP address', database user name, database password, database name, port number);
     // echo $ name; 
    // echo $ pw; 
    IF ( mysqli_connect_error ()) {
         echo "database connection failed" ;
        return;
    }
    // echo "database connection success!"; 
    // database query, the presence of the user 
    $ the Result = mysqli_query ( $ SQL , "the SELECT name info from the WHERE name = ' $ name ' ' );
     // number of rows in the query results 
    rows $ = mysqli_num_rows ( $ result );
     IF ( $ rows > 0 ) {
         // database query to the result, the same name 
        echo "user name already exists, click Retry <a href = 'http: // localhost / 0722 / form .html '> retry </a> " ; 
    } the else {
         $ BOOL = the mysqli_query ( $ SQL, "INSERT INTO info (name, password) VALUES ( ' $ name ', ' $ pw ')" );
         IF ( $ BOOL ) {
             echo "Congratulations on your successful registration, after three seconds to jump to the login page!" ; 
        } 

    }
 ?>

--------- heart note front and rear ends distal validates the username case (php, mysql binding)

Front and rear side validation username Case (php, mysql combined)

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