使用PHP为单选，选择或复选框输入分配值 [英] Assigning a value to a radio, select or checkbox input with PHP

问题描述

我有一张注册表.当用户在输入无效的优惠券代码后提交表单时，页面将重新加载，我将再次显示该表单以及他们输入的所有数据.输入字段很容易，但是我想不出一种简单的方法来对广播，复选框和选择进行同样的操作.

例如，我有:

<input type="radio" name="gender" value="male" />
<input type="radio" name="gender" value="female" />

我的PHP变量$ gender包含男性".但是，如何选择带有男性"的收音机?

与我的选择和复选框相同的问题.

解决方案

对于少数选项，您可以使用像这样的三元运算符.

<input type="radio" name="gender" value="male" <?php echo ($gender == 'male') : 'selected="selected"' : '';?> />
<input type="radio" name="gender" value="female" <?php echo ($gender == 'female') : 'selected="selected"' : '';?> />

不是最微妙的方法，但它可以工作.对于更复杂的情况，建议使用DOM解析器，例如 DOMDocument 等.

I've got a registration form. When users submit the form after entering an invalid coupon code, the page reloads and I show the form again with all the data they entered. It's easy with input fields but I can't think of a simple way to do the same with radio, checkboxes and selects.

For example I have :

<input type="radio" name="gender" value="male" />
<input type="radio" name="gender" value="female" />

I have my PHP variable $gender that contains 'male'. But how to have the radio with 'male' selected?

Same question with my selects and checkboxes.

解决方案

For a small number of options you could use a ternary operator like this.

<input type="radio" name="gender" value="male" <?php echo ($gender == 'male') : 'selected="selected"' : '';?> />
<input type="radio" name="gender" value="female" <?php echo ($gender == 'female') : 'selected="selected"' : '';?> />

Not the most subtle way but it will work. For more complicated situations its advisable to use a DOM parser like DOMDocument etc.

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