DB query from PHP gives no result but same query on phpMyAdmin works?

So I have a simple query that checks a mySQL database for articles and echos the HTML code to generate my blog dynamically. The query works when I run it directly with phpMyAdmin, but when it's called from the .php file, it show "No Results". Here is the query:

SELECT * FROM article ORDER BY article_timestamp DESC LIMIT 4;

Runs fine when tested on phpMyAdmin. But when it's in my php code it doesn't. PHP code below:

<?php

// establish connection
function connect() {
    $connection = mysql_connect ("localhost", "user", "password", "dbname") or die(mysql_error);

    return $connection;
}

$connection = connect();


// define article variables

$article_id;
$article_title;
$article_headline;
$article_image_path;
$article_body;
$article_author;
$article_tags;
$article_timestamp;

$myquery = "SELECT * FROM article ORDER BY article_timestamp DESC LIMIT 4";

$result = mysql_query($connection, $myquery);

if (mysql_num_rows($result) > 0) {

    while($row = mysql_fetch_array($result)) {
        $article_id = $row['article_id'];

        $article_title = $row['article_title'];

        $article_headline = $row['article_headline'];

        $article_image_path = $row['article_image_path'];

        $article_body = $row['article_body'];

        $article_author = $row['article_author'];

        $article_tags = $row['article_tags'];


        $article_timestamp = $row['article_timestamp'];

        echo "<!-- Blog Post -->
                <h2>
                    <a href=\"post.php?id=$article_id\">$article_title</a>
                </h2>
                <p class=\"lead\">
                    by $article_author
                </p>
                <p>Posted on $article_timestamp</p>
                <hr>
                <img class=\"img-responsive\" src=\"$article_image_path\" alt=\"\">
                <hr>
                <p class=\"lead\">$article_headline</p>
                <a class=\"btn\" style=\"border-color: #4c044d;\" href=\"post.php?id=$article_id\">Read More</a>

                <hr>";
    }
}

else {
    echo 'No Results found';
}

mysql_close ($connection);
?>

DB connection should be working fine. I added this code:

if ($connection == false) {
   echo 'whoops';
}

And the condition is never met when it's placed at various checkpoints. Can someone give me a hand? Spent hours on this and no dice. Thanks in advance.