Returns the value encoded injsonas an appropriate PHP type. Unquoted valuestrue,falseandnullare returned as and respectively. is returned if thejsoncannot be decoded or if the enco...www.php.net

新建一个captcha.php:.从index.html可以看到,提交的表单是到form.php的,所以还要有一个判断的form.php代码:...www.cnblogs.com