Select Data from Database with Id From URL - php

Question

I've a database it is look like this
|ID | Name |
|081| John Davidson|
and i have "index.php" in my website, i've learnt about php form, using method get, and the url is change to index.php?id=081
<form action="index.php" method="get">
<input name="id" value="081"/>
<input type="submit" value="Submit"/></form>
and when the page is loaded i want to show the name of id 081 from my database, how to do that?

Answer 1

Try this,
//Your index.php file
if($_GET['id']){
$id = $_GET['id'];
$sql="SELECT * FROM tableName where id='$id'";
$data = mysql_query($sql);
$row = mysql_fetch_array($data);
echo $row['name'];
}
<form action="index.php" method="get">
<input name="id" value="081"/>
<input type="submit" value="Submit"/></form>

Answer 2

After submitting , you are sending the id value with GET to index.php by url.
You can catch it with $_GET['id'],and store it in database like this:
$sql="INSERT INTO table SET id='".$_GET['id']."'";
$query=mysqli_query($connection,$sql);
If you want to retrieve this value from the database,you can do it like this:
$sql="SELECT id FROM table";
$query=mysqli_query($connection,$sql);
$row=mysqli_fetch_array($query);
echo $row['id'];
UPDATE As Abhik mentioned, those statements are very vulnerable, you should probably learn about using prepared statements here
Another simple way of avoiding sql injection , since it's pretty obvious you are new to php , is to use POST method instead of GET , and check on user input with this little function:
function test_input($data){
$data=htmlentities($data);
$data=stripslashes($data);
$data=trim($data);
return $data;
}
$id=test_input($_POST['id']);
Of course,depending on the field type, there must be some validation like min,max length , character allowed , etc.