Array compare

[UAL225]

Hello all,

I want to compare for now, two sets of arrays. I pull data from sql tables and then compare the two. I am using the

array_diff(); 

function to compare the two arrays, but its showing it as a empty array. Is that because I am not telling it which demensions to look at? Like

array_diff($array1[5], $array2[5]); 

?

Here is the current code:

<?php
//Opens a connection to the Warta Database
    try {
        $wrd1 =  new PDO('mysql:host=localhost; dbname=*****', '******', '*****');
            $wrd1->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
                $cale = $wrd1->prepare(
                "SELECT
                start,
                end,
                repeat_freq,
                repeat_int,
                repeat_end,
                allDay,
                category_id,
                description,
                link,
                venue,
                address,
                city,
                state,
                zip,
                country,
                contact,
                contact_info,
                access,
                rsvp
                FROM
                wp_aec_event
                ");
                    //executes SQL statement
                    $cale->execute();
                        //Set into array
                        $result = $cale->fetchAll(PDO::FETCH_ASSOC);
                        print_r($result);
                        echo("\n");
    

    
            //Opens a connection to the 1-sza Database
            try {
                $wrd2 = new PDO('mysql:host=localhost; dbname=*****', '*******', '**');
                    $wrd2->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
                        $cale1 = $wrd2->prepare(
                        "SELECT
                        start,
                        end,
                        repeat_freq,
                        repeat_int,
                        repeat_end,
                        allDay,
                        category_id,
                        description,
                        link,
                        venue,
                        address,
                        city,
                        state,
                        zip,
                        country,
                        contact,
                        contact_info,
                        access,
                        rsvp
                        FROM
                        wp_aec_event
                        ");
                            //executes SQL statement
                            $cale1->execute();
                                //set into array
                                $result1=$cale1->fetchALL(PDO::FETCH_ASSOC);
                                print_r($result1);
                                echo("\n");
                                
                                //testing out php array compare
                                $compare = array_diff($result, $result1);
                                print_r($compare);
            }
            catch (PDOException $ex) {
            $msg = $ex->errorInfo;
            error_log(var_export($msg, true));
            die("<p>Sorry, there was a unrecoverable database error.  Debug data has been logged.</p>");
            }

    }            
    catch (PDOException $ex) {
    $msg = $ex->errorInfo;
    error_log(var_export($msg, true));
    die("<p>Sorry, there was a unrecoverable database error.  Debug data has been logged.</p>");
    };
?>