PHP Page stops loading after script - php

Question

So this is a quick question I have about my php page. I wont put the code up because it would turn into solving the syntax. I was looking for the reason this happens.
This being, I have a .php page and it loads and about half way down and there is a short bit of php code. And in it, it echos to add a few items to a database. But then none of the rest of the html page loads.
Its a php type file.
Actually here is the part within the html.
<select id="price_select" name="priceBox">
<?php
...
//connects to database in code not shown
$result=mysqli_query("SELECT * FROM $tablename")or die(mysql_error());
$count=0;
while($row=mysqli_fetch_array($result)) {
$price = $row['price'];
if($price != NULL){
($count = $count+1);
}
echo "$(\"#price_select\").append('<option>" . $price . "</option>');";
}
if($count==0) {
echo "$(\"#price_select\").append('<option>Out of Stock</option>');";
}
?>
</select>

Answer 1

You have error on the following line:
$result=mysqli_query("SELECT * FROM $tablename")or die(mysql_error());
You must have similar:
$result=mysqli_query($link,"SELECT * FROM $tablename")or die(mysqli_error($link));
You php code should be similar:
$result=mysqli_query($link,"SELECT * FROM $tablename")or die(mysqli_error($link));
$count=0;
while($row=mysqli_fetch_array($result)) {
$price = $row['price'];
if($price != NULL){
($count = $count+1);
echo "<option> $price </option>";
}
}
if ($count === 0)
{
echo "<option>Out of Stock</option>";
}

Answer 2

change your code like below.
$html = '';
while($row=mysqli_fetch_array($result)) {
$price = $row['price'];
if($price != NULL){
($count = $count+1);
}
$html .= '<option>" . $price . "</option>';
}
if($count==0) {
echo '<option>Out of Stock</option>';
} else {
echo $html;
}

Answer 3

Modify the code adding <script>-tag as follows:
<select id="price_select" name="priceBox">
<?php
...
//connects to database in code not shown
$result=mysqli_query("SELECT * FROM $tablename")or die(mysql_error());
$count=0;
while($row=mysqli_fetch_array($result)) {
$price = $row['price'];
if($price != NULL){
($count = $count+1);
}
echo "<script>$(\"#price_select\").append('<option>" . $price . "</option>');</script>";
}
if($count==0) {
echo "<script>$(\"#price_select\").append('<option>Out of Stock</option>');</script>";
}
?>
</select>