Undefined index error message

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PHP: “Notice: Undefined variable” and “Notice: Undefined index”

I am new to PHP and playing around with it. I have following code in my php file.

$output = "<div style='display:none'>
    <div class='contact-top'></div>
    <div class='contact-content'>
        <h1 class='contact-title' style='text-align:center'>Write a Testimonial:</h1>
        <div class='contact-loading' style='display:none'></div>
        <div class='contact-message' style='display:none'></div>
        <form action='#' style='display:none'>
            <label for='contact-name'>*Name:</label>
            <input type='text' id='contact-name' class='contact-input' name='name' tabindex='1001' />
            <label for='contact-email'>*Email:</label>
            <input type='text' id='contact-email' class='contact-input' name='email' tabindex='1002' />";

    if ($extra["form_subject"]) {
        $output .= "
            <label for='contact-subject'>Subject:</label>
            <input type='text' id='contact-subject' class='contact-input' name='subject' value='' tabindex='1003' />";
    }

    $output .= "
            <label for='contact-message'>*Message:</label>
            <textarea id='contact-message' class='contact-input' name='message' cols='40' rows='4' tabindex='1004'></textarea>
            <br/>";

    if ($extra["form_cc"]) {
        $output .= "
            <label>&nbsp;</label>
            <input type='checkbox' id='contact-cc' name='cc' value='1' tabindex='1005' /> <span class='contact-cc'>Send me a copy</span>
            <br/>";
    }

    $output .= "
            <label>&nbsp;</label>
            <button type='submit' class='contact-send contact-button' tabindex='1006'>Send</button>
            <button type='submit' class='contact-cancel contact-button simplemodal-close' tabindex='1007'>Cancel</button>
            <br/>
            <input type='hidden' name='token' value='" . smcf_token($to) . "'/>
        </form>
    </div>

</div>";

    echo $output;

When I am trying to run the code, though the model box is appearing but it also showing a php error.

below is the error message I am getting

Notice: Undefined index: form_cc in F:\wamp\www\blog\wordpress\wp-content\plugins\demo\contact.php on line 56

Any idea what is going wrong?

score 2 · Answer 1 · answered Dec 02 '11 at 15:33

2

Simple, it seems that you do not have a definition of this index in the array, in this case, it seems that you are not getting the value of input

answered Dec 02 '11 at 15:33

score 2 · Accepted Answer · answered Dec 02 '11 at 15:34

2

Because the array extra has no index called form_cc. Do a var_dump of the array extra, so you can see where your problem lies. Also use the isset() and empty() methods.

answered Dec 02 '11 at 15:34

Mob

10,958
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41
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score 2 · Answer 3 · answered Dec 02 '11 at 15:34

2

In this case simply use:

if (!empty($extra["form_cc"])) {
   ...
}

empty() will check existence of key/index in the array and also whether value is set or not.

answered Dec 02 '11 at 15:34

ioseb

16,625
3
33
29

score 2 · Answer 4 · answered Dec 02 '11 at 15:34

2

The problem is that in the $extra array you haven't a position (index) called "form_cc". Thus, you should use

if (! empty($extra["form_cc"]))
{
   // do stuff
}

answered Dec 02 '11 at 15:34

Aurelio De Rosa

21,856
8
48
71

score 0 · Answer 5 · answered Dec 02 '11 at 15:37

0

if (isset($extra["form_cc"])) {
    ...
}

Will remove the warning message, this is a good habit to check isset()

answered Dec 02 '11 at 15:37

Samik Chattopadhyay

1,820
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23
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Undefined index error message

5 Answers5