问编码/解码并不总是有效- Codeigniter

EN

//other code above

<?php $encrypted = $this->encrypt->encode($data->pid); ?>
<a href="<?php echo base_url() . "profile/delete_entry/" .  $encrypted; ?>">Delete</a>

//other code below

$this->load->model('model_entry');

    $pid = $this->uri->segment(3);

    $result = $this->model_entry->entry_delete($pid);
    //redirect to entries index.php

public function entry_delete($pid) {

    $pid = $this->encrypt->decode($pid); //to decode

    $uid=$this->session->userdata('uid');

    $whereConditions = array('pid' => $pid, 'uid' => $uid);
    $this->db->where($whereConditions);

    $this->db->delete('dayone_entries');
}