how to display selected elements only from data base

get method displays in url
how to display selected elements only from data base
<?php
require 'lesson44.php';
?>
	ist access the variables of that templaates using require,  with this this page conect to database and server,
<form action ="lesson44template.php" method ="GET">	next execute form with select option , which one we select  that one displays in url,
SELECT: <select name='ab'>	it checks it submit or not, after submit, get the value with   which it is submit, it has two value,oly one at a time it ican  submit, that value it can select, after selectd it get that,  run one query, about get the  names from food table by  using type, selected some items, convert to associative array,  get that data usinf access method, that one print
<option value="f" > fruits </option>
<option value="v" > vegetables </option>
</select>
<input type="submit" value="submit">
</form>
<?php
if(isset($_GET['ab'])) {	chceks it is submit or not
$fv = $_GET['ab'];	get the what value it is submitted
echo $fv .' </br>';	print what value is submitted
$query = "SELECT `name` FROM `foods` WHERE `type` = '$fv' ";	write query what to do
if($query_run = mysqli_query($mycon, $query)){	executt that query by chceking that database
while($row = @mysqli_fetch_assoc($query_run)){	convett to associative array
$name = $row['name'];	access that associative array
echo $name .'<br><br>';
}
} else {
echo 'validity';
}
}
?>

how to use another php  page to know server and data base is connected, like template

require

where after submit it will go

action and get

optional selection

select name

we can take any thing

option value

option value

how to check it is submit or not

isset

how to get the value from url

$_GET

how to print what value it is selected

create query

query

how to execute the query

mysqli_query

how to convert that to associative array

@mysqli_fetch_assoc(

how to  access that associative array

 $row['name'];

if while else