没有从数据库获得结果

Question

So I'm checking to see if a user already liked a post. Here's what I'm doing

$id = 65;

//Get likes count
$stmt = $con->prepare("SELECT * FROM likes WHERE liked_post_id = :liked_post_id");
$stmt->bindValue(':liked_post_id', $id, PDO::PARAM_STR);
$stmt->execute();
$return = $stmt->fetchAll(PDO::FETCH_ASSOC);
?>
<pre>
<?php
print_r($return);
?>
</pre>
<?php

//Get user IP
$ip = $_SERVER['SERVER_ADDR'];

//Check if user liked post
$result = $con->prepare("SELECT * FROM likes WHERE liked_post_user = :username");
$result->bindParam(':username', $_SESSION['user']);
$result->execute();
$reprint = $result->fetch(PDO::FETCH_ASSOC);
echo $reprint['liked_post_user'];
$return_cnt =  count($reprint);

if($return_cnt < 1){
//Insert like
$query = $con->prepare("INSERT INTO likes (liked_post_id, liked_post_user, liked_post_ip) VALUES (:usr_id, :user, :ip)");
$query->bindValue(':usr_id', $id, PDO::PARAM_STR);
$query->bindValue(':user', $_SESSION['user']);
$query->bindValue(':ip', $ip, PDO::PARAM_STR);
$query->execute();
}

The problem is $query never gets ran. Even though I have no record of the username in the DB. So I'd expect it to run once, and insert $query into the DB, once. But it isn't. I'm not getting any errors either. Any ideas?

Answer 1

The second query should look for a specific liked_post_id . It's currently looking for any posts that the user liked, not just this one.

//Check if user liked post
$result = $con->prepare("SELECT * FROM likes WHERE liked_post_user = :username AND liked_post_id = :id");
$result->bindParam(':username', $_SESSION['user']);
$result->bindParam(':id', $id);
$result->execute();
$reprint = $result->fetch(PDO::FETCH_ASSOC);

And then you should test whether the query found anything by testing whether $reprint is an array or false :

if ($reprint) {
    echo $reprint['liked_post_user'];
} else {
    //Insert like
    $query = $con->prepare("INSERT INTO likes (liked_post_id, liked_post_user, liked_post_ip) VALUES (:usr_id, :user, :ip)");
    $query->bindValue(':usr_id', $id, PDO::PARAM_STR);
    $query->bindValue(':user', $_SESSION['user']);
    $query->bindValue(':ip', $ip, PDO::PARAM_STR);
    $query->execute();
}

Answer 2

First of all you can simply count $reprint . To answer your second issue, you need to select the post, or else it'll simply check all the posts. So do

$result = $con->prepare("SELECT * FROM likes WHERE liked_post_user = :username AND liked_post_id = :post_id");
$result->bindParam(':username', $_SESSION['user']);
$result->bindParam(':post_id', $_GET['id']);
$result->execute();
$reprint = $result->fetch(PDO::FETCH_ASSOC);

Note that if no user is logged in it'll still input an empty value. So make sure to figure a way around that.