Question

From php.net reference:

The value being encoded. Can be any type except a resource.
This function only works with UTF-8 encoded data.

However, I use the function like this in one case which works fine:

$result_array = $this->DatabaseObject->_pdoQuery( 'multiple', 'bookmark_model', array( $this->SessionObject->get( 'id' ) ) );
$result_string =  json_encode( $result_array );
$html_string = "<div id='bookmark_data'>" . $result_string . "</div>";
echo $html_string;

But in this case it does not:

$result_array = $this->DatabaseObject->_pdoQuery( 'multiple', 'tweet_model' );
// $tweet_object = new MarkTweet();
$result_string = json_encode( $result_array );
$html_string = "<div id='tweet_data'>" . $result_string . "</div>";
echo $html_string;

In both cases I’m using PDO library to query the database. I know I get back what should be essentially an array of arrays…but I don’t know if this is resource or not…or how it is structured internally.

There is no major difference between the queries that I can see…here they are though. Because the two cases are so similar I don’t know what is causing the fail.

Here are the queries

"bookmark_model" =>         "SELECT * FROM bookmarks WHERE id=? ORDER BY tag, title",

"tweet_model" =>            "SELECT * FROM tweets ORDER BY time DESC LIMIT 7",

Answer 1

It looks like your _pdoQuery() function returns different types in different situations. You may want to check to make sure you got a successful result before trying to encode it.