[rebecca7b]

Let’s first create our field. This field can be used however you want, but I will assume that we are working on a meta box so I am getting the field data with the function get_post_meta.
<?php
// Assuming we are setting a field inside a metabox
$field_data = get_post_meta( $post_id, 'field_data', true );

?>

<label for="field_data">
<?php _e( 'Field Name', 'yourtextdomain' ); ?>
</label>
<div id="field_data">
<?php foreach( $field_data as $field ) { ?>
<div class="field-group">
<input type="text" name="field_data[] value="<?php echo $field; ?>" />
<button type="button" class="button button-secondary field-data-remove">X</button>
</div>
<?php } ?>
</div>
<button type="button" id="field_data_add" class="button button-primary">Add</button>

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