MySql query price between range-CodePudding

Okay so I made this query for my search page:

SELECT * FROM `posts` WHERE `ad_price` >= 0 AND `ad_price` <= 300

This part shows different results based on adding these guys: ""

>= 0 AND `ad_price` <= 300

if i say >= 0 AND `ad_price` <= 300

The data returns anything between 0 and 30 but if i say >= "0" AND `ad_price` <= "300" it gets numbers up to 10,000 and 2000 etc.. why?

Here is my fully PHP prepared statement(i know they get treated as strings but how do I change that if it's in a prepared statement):

$query = "SELECT * FROM `posts` WHERE `ad_title` LIKE CONCAT('%',?,'%') AND `ad_brand` 
LIKE CONCAT('%',?,'%') AND `ad_price` >= ? AND `ad_price` <= ?"; 
$get_posts = $conn_posts->prepare($query);
$get_posts->bind_param("ssss", $title, $brand, $min_range, $max_range);

CodePudding user response：

"ssss" tells mysql to treat all the input values as strings. Use i for the parameters you want to be treated as numbers.

e.g.

"ssii"

in your case.

This is documented in the manual: https://www.php.net/manual/en/mysqli-stmt.bind-param.php