如何使用PHP验证复选框输入? [英] How to validate a checkbox input using PHP?

问题描述

我的表单中有两个复选框:

I have two check boxes in my form:

<div class="label-input-wrapper pickup">    
        <div class="form-label">I need Airport pick-up</div>
        <div class="form-input">
            <input type="checkbox" name="pick_up" value="Yes" />Yes 
            <input type="checkbox" name="pick_up" value="No" />No
            <div class="error-msg">
                <?php if(isset($errors['pick_up_no'])) { echo '<span style="color: red">'.$errors['pick_up_no'].'</span>'; } ?>
            </div>
        </div>
</div>  

保存上述复选框的值的变量: $ pickup = $ _POST ['pick_up'];

Variable that saves the value of the above check boxes: $pickup = $_POST['pick_up'];

验证:

//Check the airport pickup and make sure that it isn't a blank/empty string.
        if ($pickup == ""){
            //Blank string, add error to $errors array.        
            $errors['pick_up_no'] = "Please let us know your airport pick up requirement!";
        }       

        if (($pick_up = Yes) && ($pick_up = No)) {
            //if both selected, add error to $errors array.        
            $errors['pick_up_no'] = "Can not select Yes and No together!";
        }

但是上面的验证只是打印如果未同时选择两个，或者仅选择一个或什至两个都选择，则不能同时选择是"和否"！.对于所有选择，它都给出相同的错误消息.为什么?

But the above validation just printing Can not select Yes and No together! if both are NOT selected, or if only one selected or even both are selected. It gives same error message for all the selections. Why?

推荐答案

我不知道您为什么需要一个复选框(这是单选按钮的功能)，但是您可以执行以下操作:

I don't know why you need a checkbox for this (this is what radio button's are supposed to do), but you can do it something like:

if(!isset($_POST['pick_up']) || count($_POST['pick_up']) > 1) {
    echo 'please select at least 1 choice';
} else {
    echo $_POST['pick_up'][0];
}

然后输入您的复选框名称:

Then make your checkbox names:

name="pick_up[]"

或者如果您确实需要单独的错误消息.做这样的事情:

Or if you really need to have separate error messages. Do something like this:

$errors['pick_up_no'] = '';
if(!isset($_POST['pick_up'])) {
    $errors['pick_up_no'] = "Please let us know your airport pick up requirement!";
} elseif(count($_POST['pick_up']) > 1) {
    $errors['pick_up_no'] = "Can not select Yes and No together!"; // weird UX, should have prevented this with a radio button
}

if($errors['pick_up_no'] != '') {
    echo $errors['pick_up_no'];
} else {
    echo $_POST['pick_up'][0];
}

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