PHP: How to fix array_combine when one valus is empty

Question

How to set a = 0 value for each checkbox unchecked

Error:

Warning: array_combine() [function.array-combine]: Both parameters should have an equal number of elements in

PHP:


$combined = array_combine($_POST['name'], $_POST['day']);

foreach($combined as $name => $value) {
     echo $name.' => '.$value;
}

HTML:

  <form method="post" action="result.php">
  <p>
        <input type="text" name="name[]" value="seth" />
        <input type="checkbox" name="day[]" value="7" />
  </p>

  <p>
        <input type="text" name="name[]" value="jack" />
        <input type="checkbox" name="day[]" value="4" />
  </p>

  <p>
        <input type="text" name="name[]" value="david" />
        <input type="checkbox" name="day[]" value="3" />
  </p>

 </form>

PS:
I won't use:

        <select name="day[]" size="1">
           <option value="0"> Non </option>
           <option value="1"> Yes </option>
        </select>

Dunhamzzz · Accepted Answer · 2011-08-22 15:59:45Z

2

Your problem is that unchecked checkboxes aren't even sent to the server, so as it is your 2 $_POST arrays won't line up unless they are all checked. You should consider using radios and setting the value of the key in name attribute.

ie do this for each input:

<form>
<p>
    <input type="text" name="name[3]" value="david" />
    <input type="radio" name="day[3]" value="yes" /> <label>Yes</label>
    <input type="radio" name="day[3]" value="no" /><label>No</label>
</p>
</form>

Then do print_r($_POST) and you will see your arrays line up. Another way is to do a hidden input (with exactly the same name="" and it will act as a default value.

edited Aug 22, 2011 at 15:59

answered Aug 22, 2011 at 15:49

Dunhamzzz

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6 Comments

Dunhamzzz Over a year ago

What I am saying is that if a user doesn't tick a checkbox and submit the form, it won't appear in your $_POST array.

Saad Imran. Over a year ago

@Naiimim What Dunhamzzz means is if a checkbox is unchecked, its not included in the $_POST request sent to the server, meaning instead of sending a false value indicating the check-box is unchecked, the browser sends nothing.

Cheerio Over a year ago

@Dunhamzzz when all checkbox are checkked I get the values. But when one is not checked is get the error above

Cheerio Over a year ago

@Saad Imran: Thanks I understand. How can I set a 0 value for this checkbox unsent - I tried to use isset() ...

Dunhamzzz Over a year ago

@Naamim that's what I suggest you use Radios, or you can use hidden inputs, read the last line of my answer.

|

Saad Imran. · Accepted Answer · 2011-08-22 16:19:05Z

Here you go. Hope this works for you. It's a bit more work then what you were hoping for probably.

result.php

<?PHP

$days = array();
$namecount = count($_POST['name']);
for($i = 0; $i < $namecount; $i++){
    $days[$i] = isset($_POST['day'][$i]) ? $_POST['day'][$i] : 0;
}

$arr = array_combine($_POST['name'], $days);
print_r($arr);

?>

form.html

<form method="post" action="result.php">
    <p>
        <input type="text" name="name[]" value="seth" />
        <input type="checkbox" name="day[0]" value="7" />
    </p>

    <p>
        <input type="text" name="name[]" value="jack" />
        <input type="checkbox" name="day[1]" value="4" />
    </p>

    <p>
        <input type="text" name="name[]" value="david" />
        <input type="checkbox" name="day[2]" value="3" />
    </p>
    <input type='submit' value='Submit' />
</form>

Madara's Ghost · Accepted Answer · 2011-08-22 16:17:14Z

0

I can think of only 3 ways:

Move to <input type=radio>s with the same name, this will give you extra control over the content that is sent through. (Given in a previous answer)
Add another input, a hidden one, <input type=hidden>, which has the same name as your checkbox, if the checkbox is not selected, the hidden input's value will be sent. (Given in a previous answer)
Use JavaScript to submit your form, and loop through the checkboxes to manually test each one for selected state, and send that along with the POST request.

answered Aug 22, 2011 at 16:17

Madara's Ghost

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