PHP: blank page but no error when confronting NULL value in a function

Question

No error in log of Apache... This is my function:

function feedback($type,$message,$link=NULL) {
    if ( (isset($_POST['ajaxFeedback'])) && ($_POST['ajaxFeedback']==true) ) {
        echo '<div class="alert alert-'.$type.'">';
            echo '<p>'.$message.'</p>';
        echo '</div>';
        exit;
    } else {
        $_SESSION['typeMessage']    = $type;
        $_SESSION['message']        = $message;
        if (isset($link)) {
            header('Location: '.LINK_ASSOLUTO.$link);
        }
        exit;
    }
}

if i call it with

feedback('success','All queries OK',$link=NULL);

i obtain stop of execution of page (all rest of page will be blank). Also if I omit $link and if I pass $link without the "=NULL".

If I pass a link, e.g.

feedback('success','All queries OK','/index.php');

all works (i've used this function in several codes).

Help me.. thank you!

Why would you want to do feedback('success','All queries OK',$link=NULL); if it defaults to that? Do feedback('success','All queries OK'); instead. — alxgb
– alxgb, Commented Oct 18, 2013 at 18:09
Your code paths are confusing you. Your if() test does not consider ANYTHING of what you pass in as arguments. the if() results depend entirely on $_POST values. Note that isset($null) is FALSE, so your header() call never occurs if you don't pass in a $link, or explicitly pass in a null - your script will set two sessionv values and then simply exit. — Marc B
– Marc B, Commented Oct 18, 2013 at 18:10
@MarcB you did put me in right way. In effect that "exit" must be to stay in if (isset($link) piece of code... Thank you very much :) — sineverba
– sineverba, Commented Oct 18, 2013 at 18:23

Pitchinnate · Accepted Answer · 2013-10-18 18:12:39Z

3

You can't set a default in the call of a function only the declaration. You should either call:

feedback('success','All queries OK');

or

feedback('success','All queries OK',null);

Also if $link is null and $_POST['ajaxFeedback'] is not set your code just sets session values. However I don't see where you are using session_start()

answered Oct 18, 2013 at 18:12

Pitchinnate

7,5561 gold badge22 silver badges39 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

PHP: blank page but no error when confronting NULL value in a function

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related