如果选中复选框，则使用 PHP 更改值
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if checkbox is checked change the value using PHP
提问by Ali
I'm trying to accomplish one simple task (but is not simple for me).
我正在尝试完成一项简单的任务（但对我来说并不简单）。
I have a form and I'm having a trouble with this check box.
我有一个表单，但我在使用此复选框时遇到了问题。
<input type="checkbox" name="b"
<?php if (isset($_POST[b])) echo "value='y'"; else echo "value='n'"; ?>/>
I'm not sure if I use the right one, but it doesn't work for me.
我不确定我是否使用了正确的方法，但它对我不起作用。
So basically I want the value of the inputof bwill be yif the checkbox is checked else it will always be nif the checkbox is unchecked.
所以基本上我想要的价值input的b将是y，如果复选框被选中否则它永远是n，如果该复选框处于未选中状态。
回答by sachleen
That's not how a checkbox works.
这不是复选框的工作方式。
It's checked when the checkedattribute is there.
当checked属性存在时它会被检查。
<input type="checkbox" name="a" value="a" checked /> Checked
<input type="checkbox" name="a" value="a" /> NOT Checked
So you want to use
所以你想用
<input type="checkbox" name="a" value="a" <?php echo isset($_POST['b']) ? "checked" : ""; ?>/>
Now if $_POST['b']is set, the checkbox will be checked.
现在如果$_POST['b']设置，复选框将被选中。
Also, you have $_POST[b]. The bshould be in quotes. It should be $_POST['b']
此外，您有$_POST[b]. 本b应在引号。它应该是$_POST['b']
回答by Ravi Kant Mishra
You have to use two conditions one is for showing checked/unchecked and second for showing y/n
您必须使用两个条件，一个是显示选中/未选中，第二个是显示 y/n
<input type="checkbox" name="b" <?php echo (isset($_POST['b'])?"value='y'":"value='n'")?>
<?php echo (isset($_POST['b'])?"checked":"") ?> />
回答by user1461434
tested code!
测试代码！
<form method="post">
<input type="checkbox" name="b" <?php if (isset($_POST['b'])) echo "value='y'"; else echo "value='n'"; ?>/>
<input type="submit" name="asd" value="asd">
</form>
So go with the following
因此，请执行以下操作
<?php if (isset($_POST['b'])) echo "value='y'"; else echo "value='n'"; ?>
回答by Justin Archiquette
This worked for me:
first: Giving the checkbox a default value
then: assign the desired value only if the box is checked.
这对我
有用：
首先：为复选框提供默认值
然后：仅在选中该框时分配所需的值。
<input type="hidden" name="b" value="n">
<input type="checkbox" name="b" value="y" >
回答by Zetty 0905
*Approved by Deployment:
*经部署批准：
<input type="radio" name="dep_approval_status" value="Approved"
<?php
if ($deploy['dep_approval_status'] === "Approved")
{
echo ' checked';
}
?>
/> Yes, approved
<input type="radio" name="dep_approval_status" value="Not Approved"
<?php
if ($deploy['dep_approval_status'] === "Not Approved")
{
echo ' checked';
}
?>
/> Not Approved
