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This article will explain in detail the example analysis of cache operation skills in Smarty. The editor thinks it is very practical, so I share it with you for reference. I hope you can get something after reading this article.

The details are as follows:

Smarty cache control

Smarty provides powerful caching capabilities. But sometimes we do not want the entire document to be cached, but to selectively cache a certain part of the content or a certain part of the content is not cached. For example, you use a template at the top of the page with the location of the ad bar, which can contain any mixed information such as HTML, image, FLASH, etc. So you can't use a static link here, and we don't want the banner to be cached. This needs to be specified in the insert function and a function is needed to fetch the content information of the advertisement bar. Smarty also provides this cache control capability.

We can use {insert} to keep part of the template from being cached

You can use $smarty- > register_function ($params,&$smarty) to block the plug-in from outputting from the cache

You can also use $smarty- > register_block ($params,&$smarty) to make a piece of the entire page uncached.

Here is a simple requirement to explain each of these three ways to control the cached output.

Requirements: the current time in the cached document is not cached and varies with each refresh.

1. Use the insert function to prevent part of the template from being cached

Index.tpl:

{insert name= "get_current_time"}

Index.php

Function insert_get_current_time () {return date ("Y-m-d H:m:s");} $smarty=new smarty (); $smarty- > caching = true;if (! $smarty- > is_cached ()) {.} $smarty- > display ('index.tpl')

Notes:

Define a function with the function name format:

Inser_name (array $params, object & $smarty)

The function argument is optional, and if you need to add other attributes to the template's insert method, it will be passed to the user-defined function as an array.

Such as:

{insert name='get_current_time' local='zh'}

In the get_current_time function, we can get the attribute value through $params ['local'].

If you need to use the methods or properties of the current smarty object in the get_current_time function, you can get it through the second parameter.

At this point you will find that index.tpl has been cached, but the current time is constantly changing with each refresh.

2. Use register_function to prevent plug-ins from outputting from the cache

Index.tpl:

{current_time} {/ div}

Index.php:

Function smarty_function_current_time ($params, & $smarty) {return date ("Y-m-d H:m:s");} $smarty=new smarty (); $smarty- > caching = true;$smarty- > register_function ('current_time','smarty_function_current_time',false); if (! $smarty- > is_cached ()) {.} $smarty- > display (' index.tpl')

Notes:

Define a function with the function name format: smarty_type_name ($params, & $smarty)

Type is function

Name defines the label name for the user, in this case {current_time}

Two parameters are required, even if they are not used in the function. The functions of the two parameters are the same as above.

3. Use register_block to prevent a piece of the whole page from being cached

Index.tpl:

Page created: {"0" | date_format: "% D% H:%M:%S"} {dynamic} Now is: {"0" | date_format: "% D% H:%M:%S"}. Do other stuff... {/ dynamic}

Index.php:

Function smarty_block_dynamic ($param, $content, & $smarty) {return $content;} $smarty = new Smarty;$smarty- > caching = true;$smarty- > register_block ('dynamic',' smarty_block_dynamic', false); if (! $smarty- > is_cached ()) {.} $smarty- > display ('index.tpl')

Notes:

Define a function with the function name format: smarty_type_name ($params, & $smarty)

Type is block

Name defines the label name for the user, in this case {dynamic}

Two parameters are required, even if they are not used in the function. The functions of the two parameters are the same as above.

4. Summary

(1) ability to control cache:

You can easily control the buffer capacity of the plug-in output by using register_function and register_block. You can control whether the plug-in output is cached by the third parameter, which is cached by default. We need to set it to false, as we did in the experiment.

The copy code is as follows:

$smarty- > register_function ('current_time','smarty_function_current_time',false)

However, the insert function is not cached by default. And this property cannot be modified. In this sense, the insert function seems to have less control over the cache than register_function and register_block.

(2) convenience of use:

But the insert function is very convenient to use. Instead of displaying the registration, smarty automatically looks for the specified function during the current request as long as it is included in the current request.

Of course, register_function can also avoid displaying registrations at run time. But the effect is the same as other template functions, all cached and uncontrollable.

If you register a custom function using the display call register_function at run time, be sure to register the function before calling the is_cached () method.

Otherwise, caching the document at the step of is_cached () will cause a smarty error because the registration function cannot be found

An example of Smarty user-defined function

Use in templat

{date_now} {* or to format differently *} {date_now format= "% Y/%m/%d"} this article ends here. I hope the above content can be helpful to you so that you can learn more knowledge. if you think the article is good, please share it for more people to see.

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