Smarty template engine technology 2, smarty template engine

Smarty template engine technology

Function: Load a php file and assign the content of the loaded file to a variable

Note: This built-in function can only be used in 2.0. If used, SmartyBC.class.php must be instantiated.

Sample code:

Index.php

include 'Smarty/SmartyBC.class.php';
//InstantiationSmartyClass
$Smarty = new SmartyBC();
$Smarty->assign('name','Xiao Ming');
$Smarty->display('index.tpl');

index.tpl

<code><span><strong><em><span>{*<span>include_php</span></span>内建函数<span>*}<br/></span></em><span>{<span>include_php <span>file=<span>"date.php" <span>assign=<span>"date"<span>}<br/>{<span>$<span>date}</span></span></span></span></span></span></span></span></span></strong>
				</span></code>

Copy after login

Function: When the built-in functions of Smarty are not enough, you can expand the functions by inserting the built-in function.

Basic syntax: Create an index.php file

insert_Custom function name($arg){

echo $arg[variable defined in template]

}

Index.tpl file

{insert name=Custom function name Custom parameters... }

Sample code:

Index.php

function insert_func($arg){
echo $arg['title'];
}
function insert_date($arg){
echo $arg['say']."The weather is great today. , the current time is ".date('Y-m-d H:i:s',time());
echo '
';
echo $arg['zhangsan']."The weather is great today. The time is now".date('Y-m-d H:i:s',time());
}

index.tpl template

{insert name="func" title='PHP is the best language in the world '}
< hr>
{insert name="date" say='Lao Wang said:' zhangsan='Hahaha:'}

Sample code:

{if $age >= 18}
This person is not a minor
{elseif $age == '14'}
This person is 14 years old
{else}
This person is a minor
{/if }

Sample code:

<b>inSmarty we use {ldelim}if{rdelim}Perform conditional judgmentb>

Function: Any content in this tag will not be parsed by the Smarty template engine

Sample code:

{literal}
{*Hi, I am an annotator *}
{assign var='age' value="14"}
{/literal}

Operation effect:

Function: Native PHP code can be used in this tag.

Sample code:

{*PHPBuilt-in functions*}
{php}
echo date('Y-m-d h:i:s',time());
echo '<br>';
echo "I am at php Contents in built-in functions";
{/php}

Operation effect:

7. stripbuilt-in function

Function: Remove spaces and newlines

Sample code:

{strip}
<table>
<tr >
<td>1td>
<td>2td>
<td>3td> ;
<td>4td>
<td>5td>
tr>
table>
{/strip}

Before use:

After use:

8, section, sectionelseBuilt-in function (two-dimensional array, )

Function: Traverse the array

Basic usage:

{section loop=$arr name="index"}
{$ arr[index]}
<br>
{/section}

Parameter details: loop needs to traverse the array

Name The index of the current loop

Extended use 1: Use start step max

{section loop=$arr1 name="index" start="0" step="1" max="5"}
{$arr1[index]}
<br>
{/section}

Parameter details: start The starting index of the loop

Step The amount added each time through the loop

Max the maximum number of loops

Extended use 2: sectionelse

Function: Determine whether the looped array is empty. If it is empty, execute the following content.

Example code:

{*sectionBuilt-in functions*}
{section loop=$arr1 name="index" start="0" step ="1" max="5"}
{$arr1[index]}
<br>
{sectionelse}
<b>): There is no array or the array is emptyb>
{/section}

Traverse a two-dimensional array

Example code:

Index.php

$arr3 = array(array('name'=>'小明','age'=>25,'sex'=>'未知'),
array('name'=>'老王','age'=>26,'sex'=>'男'),
array('name'=>'老李','age'=>27,'sex'=>'你猜')
);

Index.tpl

{section loop=$arr3 name="index" }
{$arr3[index]['name']} |
{$arr3[index]['age']} |
{$arr3[index]['sex']} |
<hr/>
{/section}

运行效果：

拓展内容：

<code><span><strong>当前索引： <span><span>{<span>$<span>smarty.section.index.index} <span>->><br/></span></span></span></span>当前索引的前一个：<span>{<span>$<span>smarty.section.index.index_prev}<span>->><br/></span></span></span></span>当前索引的下一个：<span>{<span>$<span>smarty.section.index.index_next}<span>->><br/></span></span></span></span>当前所循环的次数<span>
								<span><span>{<span>$<span>smarty.section.index.iteration}<span>->><br/></span></span></span></span>判断当前是否第一次<span><span>: <span>{<span>$<span>smarty.section.index.first}<span>->><br/></span></span></span></span></span>判断当前是否最后一次：<span>{<span>$<span>smarty.section.index.last}<span>->>
</span></span></span></span></span></span></span></span></strong></span></code>

Copy after login

循环的总次数：{$smarty.section.index.total}->>

运行效果：

示例代码：

{counter start='10' }
<hr>
{counter}
<hr>
{counter print=false}
<hr>
{counter skip=2}
<hr>
{counter}
<hr>

运行效果：

基本语法：{cycle values=参数1,参数2,参数3}

示例代码：

{*cycleRealize color change of each row*}
<hr>
<table width="100%">
<tr style="background-color: {cycle values="red,green,yellow"}" >
<td>My first {counter start='1' skip='1'} cycletd>
tr>
<tr style="background-color: {cycle values="red,green,yellow"}">
<td>I The {counter} looptd>
tr>
<tr style="background-color: {cycle values="red,green,yellow"}">
<td>Myth{counter} cycletd>
tr>
<tr style="background-color: {cycle values="red,green,yellow"}">
<td> Myth{counter}Looptd>
tr>
< tr style="background-color: {cycle values="red,green,yellow"}">
<td> My first {counter} looptd>
tr>
<tr style="background-color: {cycle values="red,green,yellow"}">
<td> My number{counter} cyclestd>
tr>
< ;/table>

{debug}

Operation effect:

Function: Capture the contents of a file and assign it to a variable

Sample code:

{fetch file="shi.txt" assign="text"}
{fetch file="date.php" assign="php"}
{*变量调节器
{$text|变量调节器名称:参数1:参数2}
*}
{$php}
<hr>
{$text|nl2br}

运行效果：

<code><span><strong>{<span>html_image <span>file=<span>"1.jpg"<span>}</span></span></span></span></strong>
				</span></code>

Copy after login

参数：file 图片资源的路径

运行效果：

作用:生成一个表格，将数据遍历进去

示例代码：

{html_table loop=$arr cols="3"}

参数说明：loop 要循环遍历的数组

Cols 指定表格列数

作用：生成一组多选框

示例代码：

{html_checkboxes name = 'job'
values = $arr
checked = $arr2
output = $arr3
separator = "|"
}

参数说明： name 对应多选框中的name属性

Values 对应多选框中你的value属性

Checked 选中指定的多选框

Output 控制文本内容

Separator 连接符

运行效果：

{待补充}

示例代码：

<code><span><strong><<span>select <span>style=<span>"<span>width: <span>100<span>%;<span>"<span>><br/>
														<span>{<span>html_options <span>values    =   <span>$<span>arr<br/>                  selected  =   <span>'GO'<br/>
																				<span>output    =   <span>$<span>arr3<br/>    }<br/><span></<span>select<span>></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></strong><span>
					</span></span></code>

Copy after login

参数说明：values 下拉框选项的值

Selected 指定被选中的下拉选项，注意：必须和value的值对应

Output 输出的文本

9、html_radios自定义函数

示例代码：

<code><span><strong>{<span>html_radios <span>values     =   <span>$<span>arr<br/>             checked    =   <span>'nodejs'<br/>
											<span>output     =   <span>$<span>arr3<br/>             separator  =   <span>"|"<br/><span>}</span></span></span></span></span></span></span></span></span></span></strong>
				</span></code>

Copy after login

参数说明：values 单选框的值

Checked 指定默认被选中的单选框

Output 输出的文本

Separator 连接符

运行效果：

{待补充}

实例代码：

{section loop=$arr4 name="index" }
{html_image file="./img/{$arr4[index]}.jpg"}
<hr>
{/section}

SMARTY_DIR

$template_dir 模板目录默认是：templates
$compile_dir 编译目录默认是：templates_c
$config_dir 配置目录默认：configs
$cache_dir 缓存目录默认:cache
$left_delimiter 左定界符默认：{
$right_delimiter 右定界符默认：}

以上变量都有默认行为。

$caching Whether to enable caching
$cache_lifetime Cache life cycle: Default 3600s
$debugging Enable debugging template
$php_handling Is it allowed to introduce php in the template?

3, common methods

assign passes variables to the template
assignByRef Assign variables to template files (pass by reference)
append Append variables

$Smarty->append('var1','Xiao Ming');
$Smarty->append ('var1','25');
$Smarty->append('var1','Male');

appendByRef appends different data to the array variable of the template (passed by reference)
clearAllAssign Clear all variables in the template

$Smarty->clearAllAssign(); // Clear all template variables

clearAssign clears the specified variable

$Smarty->clearAssign('title') ;

clearCache Clear cache
configLoad Configuration loading

$Smarty->configLoad('config.conf','class2');

clearConfig Clear configuration content

$Smarty->clearConfig('name') ;

display Specify rendering template

$Smarty->display('index_3.tpl');

Load template file

Rendering template

Show template

fetch captures the template but does not output it

Load template file

Render (replace tags with php code) template file

We can implement static technology through fetch.

Index_3.php file

/*
* If any Static files are loaded, and if there is no static file, a static file is generated.
* */
if(!is_file( './html/index_3.html')){
$html = $Smarty->fetch('index_3.tpl');
file_put_contents('./html/index_3.html',$html);
echo ' There are no static files here';
include "./html/index_3.html";
}else{
echo 'There are static files here ';
include "./html/index_3.html";
}

[To be added]

templateExists determines whether the template file exists

if($Smarty->templateExists('index_4.tpl')){
$Smarty->display('index_3.tpl');
}else{
echo ' Diaoyou, the template file is not there~';
}

Added: How to read array, object in smarty template.

在模板中获取数组内容：

{*多维数组*}
{$var[0]['name']}
{*一位数组*}
{$var['name']}

在模板中获取对象内容

{*获取对象属性*}
{$std->name}
<hr>
{*获取对方法*}
{$person->speak()}

Index3.php文件

$std = new StdClass();
class person{
function __construct(){}
function speak(){
echo '你猜猜我谁?';
}
}
$person = new person();
$std->name = '张二明';

概念：一般在我们项目中，有一部分数据并不是实时更新的，但是，有又必须实时访问。如果不使用缓存技术的话，每访问一次，得查询一次或者多次数据库，那么会给数据造成很高的I/O开销。会增加服务器的压力。

用户端缓存原理：

服务器缓存原理：

//开启缓存
$Smarty->caching = true;

//设置缓存文件的生命周期
$Smarty->cache_lifetime = '7200';

缓存文件由编译文件而来。

编译文的内容何时变化？

思路：设置一个生命周期只有30秒的缓存文件，定义一个变量，在模板中使用该变量。然后打开index.php.

然后修改该变量的值。等待。。。30

Smarty缓存相关细节

<code><span><strong>$Smarty<span>->isCached(<span>'index_4.tpl'<span>)</span></span></span></strong>
				</span></code>

Copy after login

基本语法：isCached(templatesName); 检测模板文件的缓村文件是否存在
参数说明：模板文件名称

<code><span><span><strong><em>//</em></strong></span><span><strong><em>清除所有缓存<br/><span><span>$<span>Smarty->clearAllCache();<br/><span>//</span></span></span><span>清楚某模板缓存文件<br/></span></span></em><span>$Smarty<span>->clearCache(<span>'index_4.tpl'<span>);</span></span></span></span></strong>
					</span></span></code>

Copy after login

在Smarty的缓村是全局缓存，如果开启缓存，访问整个页面的数据都会被缓存，如果页面中有一些动态数据需要修改，如何处理？

如何处理页面中动态显示的数据部分呢？

<code><span><strong><span>$Smarty<span>->assign(<span>'shige'<span>,<span>'</span></span></span></span></span>《再别康桥》<span>'<span>,<span>true<span>);</span></span></span></span></strong>
				</span></code>

Copy after login

<code><span><strong>{<span>nocache<span>}<br/>    {<span>$<span>title}<br/>{/<span>nocache<span>}</span></span></span></span></span></span></strong>
				</span></code>

Copy after login

如何解决一个模板文件，动态显示不同的内容。

实际场景：譬如一个电商网站的商品详细页，会动态的根据URL上的参数，改变该页面的内容。

那么这种情况如何实现缓存呢？

http://localhost:63354/Smarty/Smarty02/index5.php?goods_id=1

http://localhost:63354/Smarty/Smarty02/index5.php?goods_id=2

http://localhost:63354/Smarty/Smarty02/index5.php?goods_id=3

http://localhost:63354/Smarty/Smarty02/index5.php?goods_id=250

在Smarty中，我们通过设置display()第二个参数，来实现，单页面，多缓存。

11、缓存集合

http://localhost:63354/Smarty/Smarty02/index5.php?goods_id=1&cate_id=15

我们通过给display（）方法设置第二个参数实现缓存集合（通过|分割）

<code><span><span><strong>$Smarty</strong></span><span><strong>->display(<span>'index_5.tpl'<span>,<span>$_GET<span>[<span>'goods_id'<span>].<span>'|'<span>.<span>$_GET<span>[<span>'cate_id'<span>]);</span></span></span></span></span></span></span></span></span></span></span></span></strong>
					</span></span></code>

Copy after login

五、过滤器

示例代码：

<code><span><strong><span>//</span><span>定义一个函数用于字符串替换</span><span>
						</span></strong></span></code>

Copy after login

<code><span><strong><span>function <span>check<span>(<span>$tpl_output<span>, <span>$smarty<span>){<br/>
													<span>$tpl_output <span>= <em>str_replace</em>(<span>'</span></span></span></span></span></span></span></span></span></span>苍井空<span><span>'<span>,<span>'</span></span></span>张某某<span>'<span>,<span>$tpl_output<span>);<br/>
											<span>return <span>$tpl_output<span>;<br/>}
</span></span></span></span></span></span></span></span></strong></span></code>

Copy after login

<code><span><strong><span>//</span><span>通过注册过滤器，实现模板中的字符串过滤</span></strong><span><strong><br/><span>$Smarty<span>->registerFilter(<span>"output"<span>,<span>"check"<span>);</span></span></span></span></span></span></strong>
					</span></span></code>

Copy after login

通过模板继承实现页面精细化拆分

示例代码：

Parent.tpl文件

<code><span><span><strong>{<span>extends <span>file=<span>"parent.tpl"<span>}<br/>{<span>block <span>name=<span>'content'<span>}<br/>
														</span></span></span></span></span></span></span></span></strong></span><span><strong>偶哈呦，哈哈哈哈<br/>
							<span><<span>hr<span>><br/><span>{/<span>block<span>}</span></span></span></span></span></span></strong>
					</span></span></code>

Copy after login

Child.tpl文件

<code><span><span><strong>{<span>extends <span>file=<span>"parent.tpl"<span>}<br/>{<span>block <span>name=<span>'content'<span>}<br/>
														</span></span></span></span></span></span></span></span></strong></span><span><strong>偶哈呦，哈哈哈哈<br/>
							<span><<span>hr<span>><br/><span>{/<span>block<span>}</span></span></span></span></span></span></strong>
					</span></span></code>

Copy after login