Codeigniter 3表格：提交后保存数据

Question

I am making a customers CRUD application with Codeigniter 3. The "Add Customer" form view looks like this:

<div class="form-group <?php if(form_error('first_name')) echo 'has-error';?>">
    <?php echo form_input('first_name', '', [
        'type'  => 'text',
        'id'    => 'first_name', 
        'class' => 'form-control',
        'value' => '',
        'placeholder' => 'First name',
        ]); 
    ?>
    <?php echo form_error('first_name'); ?>                                     
</div>

The form also has validation on some of the text fields. I wish the data that is imputed, if data is invalid, would stay after submit. What shall I add to the code above?

Answer 1

According to the Codeigniter 3 official documentation, this is how the code should look in order for the input fields data to be kept if the form is not submitted:

<?php echo form_input('first_name', set_value('first_name'), [
   'type'  => 'text',
   'id'    => 'first_name', 
   'class' => 'form-control',
   'placeholder' => 'First name',
]);?>