How to store multiple input values with same meta_key

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is there a way to store the input value from multiple custom meta box fields with the same meta_key?
I use the following code to store ONE value for the meta_key ‘startdate’: 

function startdate() {
  global $post;
  $custom = get_post_custom($post->ID);
  $startdate = $custom["startdate"][0];
  ?>

<label>Startdate</label><br/>
<input type="text" name="startdate" value="<?php echo $startdate; ?>"/>

<?php }

add_action('save_post', 'save_details');
function save_details(){
  global $post;
  update_post_meta($post->ID, "startdate", $_POST["startdate"]);
}

If i had a second input field, how can i store its value with a different meta_id but the same meta_key (startdate)? Thank you very much!

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(If i use the built-in custom field functionality i can save multiple values for the same meta key…)

Post Views: 1

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2 comments

  1. Change your form as suggested:

    function startdate() {
    global $post;
    $custom = get_post_custom($post->ID);
    echo "<label>Startdates</label><br/>";
    for ($i=0; $i<count($custom["startdate"]);$i++) {
        echo "<input type="text" name="startdate[".$i."]" value="".$custom["startdate"][$i]."" />";
    }
}

    You’ll have to remove and reinstate your individual postmeta entries:

    add_action('save_post', 'save_details');

function save_details($post_id) {
    if ($parent_id = wp_is_post_revision($post_id)) $post_id = $parent_id;

    if (!empty($_POST['startdate']) && is_array($_POST['startdate'])) {
        delete_post_meta($post_id, 'startdate');
        foreach ($_POST['startdate'] as $startdate) {
            add_post_meta($post_id, 'startdate', $startdate);
        }
    }
}

    Then, of course, you’ll need to add some sort of add/remove mechanism to your metabox form, probably through JS.

  2. As mentioned by t31os try changing your form inputs to use name="startdate[]" then loop through the array saving each value:

    foreach ($_POST["startdate"] as $datevalue) {
    update_post_meta($post->ID, "startdate", $datevalue);
}