php array loop in jquery: alert [ object object]

Question

I have an array in php named $post_id

$post_id = $wpdb->get_results("SELECT DISTINCT user_id FROM $wpdb->pmpro_membership_orders");

I iterate through a PHP array in jQuery

 jQuery(document).ready(function( $ ) {

        var id_user = userSettings.uid ;
    //  alert(id_user);
        var arrayFromPHP = <?php echo json_encode($post_id) ?>;
        $.each(arrayFromPHP, function (i, elem) {
            // do your stuff
            if (id_user  == JSON.stringify(elem)){
                alert('yess');
                alert(JSON.stringify(elem));
            }
            else{
                alert(id_user);
                alert(JSON.stringify(elem));

            }
        });

    });

and i get always in my alert [object object]. and id_user alert , but he should show 5 'yess' and the id that he equal to id user.

Show your research. Have you tried debugging this yourself? What is actually being tested by the if statement, and is it expected? SO is not a great debugger, so you are encourage to do this yourself first: ericlippert.com/2014/03/05/how-to-debug-small-programs — user1531971
– user1531971, Commented Aug 29, 2018 at 16:19

Luis Vasquez · Accepted Answer · 2018-08-29 17:07:08Z

1

what json_encode does is convert to a text string in json format

example:

$post_id = array(array("id" => 1), array("id" => 2));

$json_string = json_encode($post_id);

// json_string = "[{"id" => 1, "id" => 2}]"

In Java script

var arrayFromPHP = <?php echo json_encode($post_id) ?>;
console.log(arrayFromPHP);
// arrayFromPHP = "[{"id" => 1, "id" => 2}]" <-- (string)

var arrayFromPHP = JSON.parse('<?php echo json_encode($post_id) ?>');
console.log(arrayFromPHP);
// arrayFromPHP = [{"id" => 1, "id" => 2}]  <-- JavaScript Object|Array

edited Aug 29, 2018 at 17:07

answered Aug 29, 2018 at 16:46

Luis Vasquez

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Luis Vasquez Over a year ago

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