模板输出的数组中增加三元运算符来判断，数组运算符
得出一个好用的判断方法，在模板输出的数组中增加三元运算符来判断，挺方便的。当然你也可以用Ajax~
<span><html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题</title>
</head>
<body><span>
我的口号是什么？——</span>><{<span>$data</span>['user']?'没有问题':Wow搞大了}> <br/> //提醒：三元运算符不能接受符号，不然会报错！
<{<span>$data</span>['email']}> <br/>
<{<span>$data</span>['address']}><br/>
<{<span>$data</span>['num']+10}><br/>
</body>
</html></span>
控制器方法
<span><?php</span><br /><span>namespace Home\Controller;</span><br /><span>use Think\Controller;</span><br /><span> <span>public</span> <span>function</span><span> index(){
</span><span>$data</span>['user']='我爱的是你爱我'<span>;
</span><span>$data</span>['email']='integer@gmail.cn'<span>;
</span><span>$data</span>['address']='中国大陆'<span>;
</span><span>$data</span>['num']='21'<span>;
</span><span>//</span><span>$this->assign('num',10);</span>
<span>$this</span>->assign('data',<span>$data</span><span>);
</span><span>$this</span>-><span>display();
}</span></span>
三元运算符 ？：
例如：i= 2 > 3 ? 0 : 1
2大于3嘛，如果是，就得到i = 0；否则i=1.
选B
三目运算符?:; ，属于关系运算符，
常用于关系比较，主要用于比较关系的状态只有两种的情况（大于 和 不大于，真 和 假）
先求表达式1的值, 如果为真, 则执行表达式2，并返回表达式2的结果 ; 如果表达式1的值为假, 则执行表达式3 ，并返回表达式3的结果
比如以下表达式：
a>0? a++:（a = 1）
当a>0为真 时，执行a++，整个表达式的值等于表达式a++的值，
当a>0为假 时，执行a=1，整个表达式的值等于表达式a=1的值。
参考资料：zhidao.baidu.com/question/341063017.html
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