当输入值为'0'时，empty（$ _ POST ['var']）返回true [英] empty($_POST['var']) returns true when the input value is '0'
问题描述
$
I have an input in a form like so
<input name='var' type='number'>
提交表单时，通过POST将输入发送到PHP文件。
在PHP文件中，通过检查
When the form is submitted, input is sent to a PHP file through POST. On the PHP file, it checks to see if the input is filled out by checking
empty($_POST['var'])
当我在文本框中输入'0'（零）并提交表单，尽管我尝试了print_r（$ _ POST），'var'显然具有值'0'，但PHP代码为空（$ _ POST ['var']）返回'1'。
When I enter '0' (zero) into the textbox and submit the form, the PHP code returns '1' for empty($_POST['var']) even though I have tried print_r($_POST) and 'var' clearly has the value of '0'.
这是否应该发生？我是否也需要为这个异常检查== 0？谢谢。
Is this supposed to happen? Do I just need to also check for == 0 for this exception? Thanks.
推荐答案
要检查字段是否填充，请使用 isset（$ _ POST ['var ']）而不是空（$ _ POST ['var']）。
To check whether the field is filled or not, please use isset($_POST['var']) instead of empty($_POST['var']).
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