Implode error for PHP

Question

I have a form where I've got three checkboxes like this:

    <td>Wireless <input type="checkbox" name="services[]" value="wireless" /></td>
      </tr>
  <tr>
    <td>Cellular <input type="checkbox" name="services[]" value="cellular" /></td>
  </tr>
  <tr>
    <td>Security <input type="checkbox" name="services[]" value="Security" /></td>
<input type="submit" name="submit">

and then I extract($_POST), and have this code

$comServices = implode(",", $services);

but I get an error:

Warning: implode() [function.implode]: Invalid arguments passed in ..

does anyone know why Im getting this error?

kb. · Accepted Answer · 2010-05-06 21:23:26Z

17

If none of your checkboxes was selected $services would be undefined rather than an empty array.

You can do $comServices = implode(",", (array)$services); to prevent it.

answered May 6, 2010 at 21:23

kb.

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3 Comments

Doug Molineux Over a year ago

thanks man this worked! Ill accept this answer when the time limit expires

kb. Over a year ago

You might want to use isset() to prevent warnings.

Doug Molineux Over a year ago

I'll put an exception where if its empty $comservices = "none" thanks again

Pekka · Accepted Answer · 2010-05-06 21:24:16Z

2

$services will be empty when there is no check box checked (empty as in null, not as in "an empty array").

You'd have to test whether $services actually is an array:

if (is_array($services))
 $comServices = implode(",", $services)

answered May 6, 2010 at 21:24

Pekka

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Comments

Macmade · Accepted Answer · 2010-05-06 21:24:44Z

0

Usually, that means your variable is not an array... You can check for it with the is_array() function...

answered May 6, 2010 at 21:24

Macmade

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