使用php验证复选框有效性实例代码

<?php  
/**  
* 在php中验证复选框的有效性  
*/ 
$value = &#39;yes&#39;;  
echo "<input type=&#39;checkbox&#39; name=&#39;subscribe&#39; value=&#39;yes&#39;/> 验证数据";  

if (isset($_POST[&#39;subscribe&#39;])) {  
    if ($_POST[&#39;subscribe&#39;] == $value) {  
        $subscribed = true;  
    } else {  
        $subscribed = false;  
        print &#39;提交的复选框值无效。&#39;;  
    }  
} else {  
    $subscribed = false;  
}  

if ($subscribed) {  
    print &#39;验证有效！&#39;;  
} else {  
    print &#39;验证无效！&#39;;  
}