Smarty template engine technology 2, smarty template engine_PHP tutorial

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>

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>

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>

 

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>

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>

 

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>

• 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>

 

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>

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

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

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

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

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>

 

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>

<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>

<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>

 

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>

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>

 

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