Php 7 error for a simple form getting Object of class mysqli could not be converted to int - php-7

Question

The code gets error saying Object of class mysqli could not be converted to int. When i try to load the page i get this error,i checked other questions but it was not helpful
<?php
$conn = mysqli_connect("localhost", "root", "", "coinlion");
if ($conn == 0) {
echo "could not connect";
} else {
mysqli_select_db("coinlion");
echo "connected";
}
?>
<form method="post">
<style>
#newlink {
width: 600px
}
</style>
<div id="newlink">
<div>
<table border=0>
<tr>
<td> Link URL:</td>
<td><input type="text" name="linkurl" value="" required></td>
</tr>
<tr>
<td> Link Description:</td>
<td><textarea name="linkdesc" cols="50" rows="5" required></textarea>
</td>
</tr>
</table>
</div>
</div>
<p>
<br>
<input type="submit" name="submit1">
<input type="reset" name="reset1">
</p>
php code
<?php
if (isset($_POST['submit1'])) {
$linkurl = $_POST['linkurl'];
$linkdesc = $_POST['linkdesc'];
mysqli_query($conn, "insert into
test(linkurl,linkdesc)values('$_POST[linkurl]','$_POST[linkdesc]')");
echo "data inserted";
}
?>

Answer 1

Well the issue was with the line if($conn==0) ,This value was taken as an integer so the error occured and an Connection variable to Mysqli_select_db was missing , after fixing it , the code ran successfully