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Implode error for PHP

I have a form in which I have three checkboxes:

    <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 fetch ($ _ POST) and have this code

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

but I am getting the error:

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

Does anyone know why I am getting this error?

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3 answers


If none of your checkboxes are selected, $ services will be undefined and not an empty array.



You can do $comServices = implode(",", (array)$services);

to prevent it.

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$services

will be empty if the checkbox is not checked (empty as in null

, not as in "empty array").

You will need to check if $ services is indeed an array:



if (is_array($services))
 $comServices = implode(",", $services)
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This usually means that your variable is not an array ... You can check it with the is_array () function ...

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