PHP - Debug Insert Statement

Folks,

Tell me, do you see anything wrong in my INSERT ?

If not, then why is it not INSERTING ? I get no php error, nor mysql error. Button I click. Then form data vanishes as if submitted. I check db and no submission came through!

	<?php
//include('error_reporting.php');
ini_set('error_reporting','E_ALL');//Same as: error_reporting(E_ALL);
ini_set('display_errors','1');
ini_set('display_startup_errors','1');
?>
	<form name = "submit_link" method = "POST" action="<?php echo $_SERVER['PHP_SELF']; ?>">
<label for="domain">Domain:</label>
<input type="text" name="domain" id="domain" placeholder="Input Domain">
<br>
<label for="domain_email">Domain Email:</label>
<input type="email" name="domain_email" id="domain_email" placeholder="Input Domain Email">
<br>
<label for="url">Url:</label>
<input type="url" name="url" id="url" placeholder="Input Url">
<br>
<label for="link_anchor_text">Link Anchor Text:</label>
<input type="text" name="link_anchor_text" id="link_anchor_text" placeholder="Input Link Anchor Text">
<br>
<textarea rows="10" cols="20">Page Description</textarea>
<br>
<label for="keywords">Keywords:</label>
<input type="text" name="keywords" id="keywords" placeholder="Input Keywords related to Page">
<br>
<button type="submit">Click me</button>
<br>
<input type="reset">
<br>
</form>
	<?php
	if($_SERVER['REQUEST_METHOD'] === 'POST')
{
    /*
    if(ISSET($_POST['submit_link']))
    {*/
        mysqli_report(MYSQLI_REPORT_ALL|MYSQLI_REPORT_STRICT);
        mysqli_connect("localhost","root","","test");
        $conn->set_charset("utf8mb4");
        
        if(mysqli_connect_error())
        {
            echo "Could not connect!" . mysqli_connect_error();
        }
        
        $query = "INSERT into links (domain,domain_email,url,link_anchor_text,page_description,keywords) VALUES (?,?,?,?,?,?)";
	        $stmt = mysqli_stmt_init($conn);
	        if(mysqli_stmt_prepare($stmt,$query))
        {
            mysqli_stmt_bind_param($stmt,'ssssss',$_POST['domain'],$_POST['domain_email'],$_POST['url'],$_POST['link_anchor_text'],$_POST['page_description'],$_POST['keywords']);
            mysqli_stmt_execute($stmt);
            
            mysqli_stmt_close($stmt);
            mysqli_close($conn);
        }
        else
        {
            die("INSERT failed!");
        }
    //}
}
	?>
	

@MacGuyver,

I will do the VALIDATIONS later. Remember, I was testing myself how much I can code without notes. What you see above was from my memory. Am still a beginner php student for 3yrs now, however!

As for validation stuff will have to check notes and learn or relearn. Meaning, have to memorise the code before I add it here on current project. And so for now, ignore VALIDATIONS and let me know why it's not submitting data into db.