CodeIgniter POST/GET default value

问题:

Can I set default value for POST/GET data if it's empty/false, something like

$this->input->post("varname", "value-if-falsy")

?

So I don't have to code like

$a = $this->input->post("varname") ? 
     $this->input->post("varname") :
     "value-if-falsy"

Thanks.

回答1:

You have to override the default behaviour.

In application/core create MY_Input.php

class MY_Input extends CI_Input
{
        function post($index = NULL, $xss_clean = FALSE, $default_value = NULL)
        {
            // Check if a field has been provided
            if ($index === NULL AND ! empty($_POST))
            {
                $post = array();

                // Loop through the full _POST array and return it
                foreach (array_keys($_POST) as $key)
                {
                    $post[$key] = $this->_fetch_from_array($_POST, $key, $xss_clean);
                }

                return $post;
            }

            $ret_val = $this->_fetch_from_array($_POST, $index, $xss_clean)
            if(!$ret_val)
                $ret_val = $default_value

            return $ret_val;
        }
}

And then in your controller :

$this->input->post("varname", "", "value-if-falsy")

回答2:

It works for me, I have used the @AdrienXL trick.

Just create your application/core/MY_Input.php file and call the parent method (you can find this methods inside CodeIgniter system folder system/core/Input.php:

<?php (defined('BASEPATH')) OR exit('No direct script access allowed');

class MY_Input extends CI_Input
{
    function post($index = NULL, $default_value = NULL, $xss_clean = FALSE)
    {
        $value = parent::post($index, $xss_clean);

        if(!$value)
            $value = $default_value;

        return $value;
    }

    function get($index = NULL, $default_value = NULL, $xss_clean = FALSE)
    {
        $value = parent::get($index, $xss_clean);

        if(!$value)
            $value = $default_value;

        return $value;
    }
}

So, when call the method, pass the default value:

$variable = $this->input->post("varname", "value-if-falsy");

回答3:

You can simplify the code block as below

public function post($index = NULL, $xss_clean = NULL, $default_value = NULL  )
{
    if( is_null( $value = $this->_fetch_from_array($_POST, $index, $xss_clean ) ) ){
        return $default_value;
    }
    return $value;
}

回答4:

Just found out not very long ago that I can also use ?:, eg.

$name = $this->input->post('name') ?: 'defaultvalue';