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07-10-2011, 07:55 PM

[eluser]sqwk[/eluser]

Code:
if($this->input->post('first_name')) {

   // Do something

};

When the first name field has been set (The form has been submitted) but is empty ('') the if statement will not execute.

However, when one saves the post value into a variable first, it will.

Code:
$first_name = $this->input->post('first_name');

if(isset($first_name)) {

   // Do something

};

Inconsistent?

07-10-2011, 09:12 PM

[eluser]dioramayuanito[/eluser]

Code:
&lt;?php

if (!defined('BASEPATH'))

    exit('No direct script access allowed');

class Test extends CI_Controller {

    function __construct() {

        parent::__construct();

    }

    function index() {

?&gt;

&lt;html&gt;&lt;head>&lt;title&gt;Test&lt;/title&gt;&lt;/head>

&lt;body&gt;&lt;form action="/index.php?fa=test&m=post" method="post">

    &lt;input type="text" name="thisis"&gt;

    &lt;input type="submit" name="Submit" value="submit"&gt;

&lt;/form&gt;&lt;/body>

&lt;/html&gt;

&lt;?php

    }

    function post() {

        //first if

        if ($this->input->post('thisis')) {

            echo("ok1\r\n");

        }

        //second if

        $thisis = $this->input->post('thisis');

        if ($thisis) {

            echo("ok2\r\n");

        }

        echo("end\r\n");

    }

}

"first if" and "second if" run exactly the same. Am i missing somethin?

07-10-2011, 09:30 PM

[eluser]sqwk[/eluser]
You used if($thisis) and not if(isset($thisis))—sorry, apparently posted the wrong example…

I get the following:

Code:
$field = $this->input->post('field')

// Form has been submitted, but has empty value (Set, but empty)

if ($this->input->post('field')) // FALSE -------------------------- Should be TRUE, or not?

if (isset($field)) // TRUE

if ($field) // FALSE

// Form has been submitted and has a value (Set and not empty)

if ($this->input->post('field')) // TRUE

if (isset($field)) // TRUE

if ($field) // TRUE

// Form has not been submitted (Not set) (No POST data according to profiler)

if ($this->input->post('field'))  // FALSE

if (isset($field)) // TRUE --------------------------- Or rather this should be FALSE?

if ($field) // FALSE

07-10-2011, 09:45 PM

[eluser]dioramayuanito[/eluser]

Code:
// Form has been submitted, but has empty value (Set, but empty)

if ($this->input->post('field')) // FALSE -------------------------- Should be TRUE, or not?

because $this->input->post('field') contains empty string ''. it returns FALSE if you use it inside if-statement.
it actually same with $field.

All issets return TRUE because you already declare $field before you use isset($field) statement.
every variables which already declared

Code:
$var = '';

// This will evaluate to TRUE so the text will be printed.

if (isset($var)) {

    echo "This var is set so I will print.";

}

from isset example at http://php.net/manual/en/function.isset.php

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