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HomeBackend DevelopmentPHP TutorialThinkPHP模版引擎之变量输出详解_PHP

本文实例分析了ThinkPHP模版引擎中变量输出的用法。分享给大家供大家参考。具体分析如下:

我们已经知道了在Action中使用assign方法可以给模板变量赋值,赋值后怎么在模板文件中输出变量的值呢?

如果我们在Action中赋值了一个name模板变量:

代码如下:

$name = 'ThinkPHP';
$this->assign('name',$name);


使用内置的模板引擎输出变量,只需要在模版文件使用:
{$name}

模板编译后的结果就是

代码如下:

最后运行的时候就可以在标签位置显示ThinkPHP的输出结果,注意模板标签的{和$之间不能有任何的空格,否则标签无效。普通标签默认开始标记是 {,结束标记是 },也可以通过设置TMPL_L_DELIM和TMPL_R_DELIM进行更改,例如,我们在项目配置文件中定义:

代码如下:

'TMPL_L_DELIM'=>' 'TMPL_R_DELIM'=>'}>',


那么,上面的变量输出标签就应该改成:

后面的内容我们都以默认的标签定义来说明,assign方法里面的第一个参数才是模板文件中使用的变量名称,如果改成下面的代码:

代码如下:

$name = 'ThinkPHP';
$this->assign('name2',$name);


再使用{$name} 输出就无效了,必须使用 {$name2}才能输出模板变量的值了.如果我们需要把一个用户数据对象赋值给模板变量:

代码如下:

$User = M('name');
$user = $User->find(1);
$this->assign('user',$user);


也就是说$user其实是一个数组变量,我们可以使用下面的方式来输出相关的值:

代码如下:

{$user['name']}//输出用户的名称
{$user['email']} //输出用户的email地址


如果$user是一个对象而不是数组的话.

代码如下:

$User = M('name');
$User->find(1);
$this->assign('user',$User);


可以使用下面的方式输出相关的属性值:

代码如下:

{$user:name}// 输出用户的名称
{$user:email} // 输出用户的email地址


3.1版本以后,类的属性输出方式有所调整,支持原生的PHP对象写法,所以上面的标签需要改成:

代码如下:

{$user->name}// 输出用户的名称
{$user->email} // 输出用户的email地址


为了方便模板定义,还可以支持点语法,例如,上面的 

代码如下:

{$user['name']}// 输出用户的名称
{$user['email']} // 输出用户的email地址


可以改成

代码如下:

{$user.name}
{$user.email}


因为点语法默认的输出是数组方式,所以上面两种方式是在没有配置的情况下是等效的,我们可以通过配置TMPL_VAR_IDENTIFY参数来决定点语法的输出效果,以下面的输出为例:{$user.name}

如果TMPL_VAR_IDENTIFY设置为array,那么

{$user.name}和{$user['name']}等效,也就是输出数组变量.

如果TMPL_VAR_IDENTIFY设置为obj,那么

{$user.name}和{$user:name}等效,也就是输出对象的属性。

如果TMPL_VAR_IDENTIFY留空的话,系统会自动判断要输出的变量是数组还是对象,这种方式会一定程度上影响效率,而且只支持二维数组和两级对象属性。

如果是多维数组或者多层对象属性的输出,可以使用下面的定义方式:

代码如下:

{$user.sub.name}//使用点语法输出

或者使用

代码如下:

{$user['sub']['name']}// 输出三维数组的值 
{$user:sub:name}// 输出对象的多级属性

希望本文所述对大家基于ThinkPHP框架的PHP程序设计有所帮助。

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