Analysis of variable output of ThinkPHP template engine

This article mainly introduces the usage of variable output of ThinkPHP template engine, and analyzes the common usage and usage skills of variable output. It is of great practical value. Friends in need can refer to it

This article analyzes ThinkPHP with examples Usage of variable output in template engine. Share it with everyone for your reference. The specific analysis is as follows:

We already know that we can use the assign method in Action to assign values ​​to template variables. How to output the value of the variable in the template file after assigning it?

If we assign a name template variable in Action:

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

Use the built-in template engine to output the variable, just use it in the template file:
{$name}

The result after template compilation is

<?php echo($name);?>

When it is finally run, the output result of ThinkPHP can be displayed at the label position. Note that there cannot be any spaces between the { and $ of the template label, otherwise the label will be invalid. The default start tag of ordinary tags is {, and the end tag is }. It can also be changed by setting TMPL_L_DELIM and TMPL_R_DELIM. For example, we define in the project configuration file:

&#39;TMPL_L_DELIM&#39;=>&#39;<{&#39;,  
&#39;TMPL_R_DELIM&#39;=>&#39;}>&#39;,

Then, the above variable output label should be changed Into:

<{$name}>

We will use the default tag definition to explain the following content. The first parameter in the assign method is the variable name used in the template file. If it is changed to the following code:

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

The output will be invalid if {$name} is used again. {$name2} must be used to output the value of the template variable. If we need to assign a user data object to the template variable:

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

Also That is to say, $user is actually an array variable. We can use the following method to output related values:

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

If $user is an object instead of an array.

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

You can use the following Output related attribute values ​​in the following way:

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

After version 3.1, the class attribute output method has been adjusted to support the native PHP object writing method, so the above tag needs to be changed to:

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

In order to facilitate template definition, dot syntax can also be supported. For example, the above

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

can be changed to

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

. Because the default output of dot syntax is array mode, the above two methods are available without It is equivalent under configuration. We can determine the output effect of point syntax by configuring the TMPL_VAR_IDENTIFY parameter. Take the following output as an example: {$user.name}

If TMPL_VAR_IDENTIFY is set to array, then

{$user.name} is equivalent to {$user['name']}, which is the output array variable.

If TMPL_VAR_IDENTIFY is set to obj, then

{ $user.name} is equivalent to {$user:name}, which is the attribute of the output object.

If TMPL_VAR_IDENTIFY is left blank, the system will automatically determine whether the variable to be output is an array or an object. This method will affect efficiency to a certain extent, and only supports two-dimensional arrays and two-level object attributes.

If it is the output of a multi-dimensional array or multi-layer object attribute, you can use the following definition method:

{$user.sub.name}//使用点语法输出

or use

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

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