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原文转载自:http://www.html-form-guide.com/php-form/php-form-checkbox.html
单个checkbox
形如：
<form action="checkbox-form.php" method="post"> Do you need wheelchair access? <input type="checkbox" name="formWheelchair" value="Yes" /> <input type="submit" name="formSubmit" value="Submit" /> </form>
如果`$_POST[‘formWheelchair‘]`的值是"Yes"，那么该checkbox被勾选
如果该checkbox未被勾选，那么`$_POST[‘formWheelchair‘]`将不被设置
如下是PHP处理表单的方式：
<?php if(isset($_POST[‘formWheelchair‘]) && $_POST[‘formWheelchair‘] == ‘Yes‘) { echo "Need wheelchair access."; } else { echo "Do not Need wheelchair access."; } ?>
isset方法可用于判定`formWheelchair`是否被勾选，如没有则返回false
checkbox组合
经常性的情况是多个checkbox，示例如下：
<form action="checkbox-form.php" method="post"> Which buildings do you want access to?<br /> <input type="checkbox" name="formDoor[]" value="A" />Acorn Building<br /> <input type="checkbox" name="formDoor[]" value="B" />Brown Hall<br /> <input type="checkbox" name="formDoor[]" value="C" />Carnegie Complex<br /> <input type="checkbox" name="formDoor[]" value="D" />Drake Commons<br /> <input type="checkbox" name="formDoor[]" value="E" />Elliot House <input type="submit" name="formSubmit" value="Submit" /> </form>
请注意checkbox有完全相同的名称，(formDoor[],也请注意每个名字以[]结尾)，使用[]代表每一个被勾选的复选框的值组成一个数组在PHP中获取，$_POST[‘formDoor’]将返回一个有被勾选复选框的值组成的数组
举个列子，我勾选了所有复选框，$_POST[‘formDoor‘]将会返回{A,B,C,D,E}数组，下例是如何取出数组值并显示出来：
<?php $aDoor = $_POST[‘formDoor‘]; if(empty($aDoor)) { echo("You didn‘t select any buildings."); } else { $N = count($aDoor); echo("You selected $N door(s): "); for($i=0; $i < $N; $i++) { echo($aDoor[$i] . " "); } } ?>
可见`empty()`可用于数组的判空,`count`用于数组计数
检查某一特定选项是否被check
function IsChecked($chkname,$value) { if(!empty($_POST[$chkname])) { foreach($_POST[$chkname] as $chkval) { if($chkval == $value) { return true; } } } return false; }
来自StackOverflow的问答
If your HTML page looks like this:
<input type="checkbox" name="test" value="value1">
After submitting the form you can check it with:
isset($_POST[‘test‘])
or
if ($_POST[‘test‘] == ‘value1‘) ...
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原文地址：http://www.cnblogs.com/gabygoole/p/5372034.html
