为图像“标记”搜索功能运行 SQL

Question

I am trying to get my code to run a search function which in theory runs a search for image "tagging" I have created my databases and the connection works fine. I have also set up 3 tables one for each part that plays for this "tag image search" to work. It is just when running the program and executing the code that it does not work and comes up with the following error message:

Notice: Undefined variable: searchesvale in C:\xampp\htdocs\galleryViewer\searchingtags.php on line 33

The code can be shown below with the "SQL Select statement" which is trying to run so when searching for a "particular image tag" this image will be retrieved from the gallery based on the "tag keyword search".

   $searchvalueentered = $_POST['searchvalue'];
$sql = "SELECT pictures.idpic, pictures.name, pictures.info, pictag.tagpicID, pictag.pictagName, tagging.IDimage, tagging.tagpicID FROM pictures, pictag, tagging WHERE pictures.idpic = '$searchvalue' AND pictag.tagpicID= '$searchvalue' AND tagging.tagpicID= '$searchvalue'";

Answer 1

$sql = "SELECT pictures.idpic, pictures.name, pictures.info, pictag.tagpicID, pictag.pictagName, tagging.IDimage, tagging.tagpicID FROM pictures, pictag, tagging WHERE pictures.idpic = '**$searchvalue**' AND pictag.tagpicID= '**$searchvalue**' AND tagging.tagpicID= '**$searchvalue**'";

Scroll to the right and I highlighted the variable $searchvalue . This error says that this variable is not defined. You have the variable $searchvalueentered defined, and $_POST['searchvalue'] , but NOT $searchvalue .