PHP 的内爆错误
我有一个表单，其中有三个复选框，如下所示：
<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">
然后我提取（$_POST），并有此代码，
$comServices = implode(",", $services);
但出现错误：
警告：implode() [function.implode]：传入的参数无效..
有谁知道为什么我会收到此错误？
I have a form where I've got three checkboxes like this:
<td>Wireless <input type="checkbox" name="services[]" value="wireless" /></td>
</tr>
<tr>
<td>Cellular <input type="checkbox" name="services[]" value="cellular" /></td>
</tr>
<tr>
<td>Security <input type="checkbox" name="services[]" value="Security" /></td>
<input type="submit" name="submit">
and then I extract($_POST), and have this code
$comServices = implode(",", $services);
but I get an error:
Warning: implode() [function.implode]: Invalid arguments passed in ..
does anyone know why Im getting this error?
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如果没有选择任何复选框，$services 将是未定义的而不是空数组。
您可以执行
$comServices = implode(",", (array)$services);来防止它。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.当没有选中复选框时，
$services将为空（如null中的空，而不是“空数组”中的空）。您必须测试 $services 是否实际上是一个数组：
$serviceswill be empty when there is no check box checked (empty as innull, not as in "an empty array").You'd have to test whether $services actually is an array:
通常，这意味着您的变量不是数组...您可以使用 is_array() 函数检查它...
Usually, that means your variable is not an array... You can check for it with the is_array() function...