在函数内运行查询

Question

I have searched everywhere without behing able to figure out the right way forward.

In my controller.php I have:

<?php $get_listing = function ($id) {
$results = $db->query("SELECT * FROM listings ORDER BY date DESC");
$listings = $results->fetchAll(PDO::FETCH_ASSOC);
} ?>

Above is my function for retrieving data from the database. I want to retrieve a specific row based on the variable $id.

Now, in my ad-details.php, I have:

<?php foreach(get_listing($id) as $info) {
echo $info["price"]; }

I get an error message saying that the function get_listing is undefined, which is strange because the controller.php is included in the ad-details.php

Any ideas guys? Any help would be highly appreciated.

Answer 1

2 errors:

1 - You forgot

global $db;

and the return statement in your function.

2 - If you use anonymous functions , you need to call them with $ sign. Probably

<?php 
   foreach($get_listing($id) as $info) {
       echo $info["price"]; 
   }
?>

is working.

Answer 2

You've set your function to a variable named $get_listing , but call it with get_listing .

Either declare your function like this.

function get_listing($id)

Or call it like this.

$get_listing($id)

Answer 3

<?php
function get_listing($id)
  {
    $results  = $db->query("SELECT * FROM listings ORDER BY date DESC");
    $listings = $results->fetchAll(PDO::FETCH_ASSOC);
  }
?>