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>內(nèi)建函數(shù)<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}

運(yùn)行效果：

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拓展內(nèi)容：

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<code><span><strong>當(dāng)前索引： <span><span>{<span>$<span>smarty.section.index.index} <span>->><br/></span></span></span></span>當(dāng)前索引的前一個：<span>{<span>$<span>smarty.section.index.index_prev}<span>->><br/></span></span></span></span>當(dāng)前索引的下一個：<span>{<span>$<span>smarty.section.index.index_next}<span>->><br/></span></span></span></span>當(dāng)前所循環(huán)的次數(shù)<span>
								<span><span>{<span>$<span>smarty.section.index.iteration}<span>->><br/></span></span></span></span>判斷當(dāng)前是否第一次<span><span>: <span>{<span>$<span>smarty.section.index.first}<span>->><br/></span></span></span></span></span>判斷當(dāng)前是否最后一次：<span>{<span>$<span>smarty.section.index.last}<span>->>
</span></span></span></span></span></span></span></span></strong></span></code>

循環(huán)的總次數(shù)：{$smarty.section.index.total}->>

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運(yùn)行效果：

示例代碼：

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

運(yùn)行效果：

基本語法：{cycle values=參數(shù)1,參數(shù)2,參數(shù)3}

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示例代碼：

{*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"}
{*變量調(diào)節(jié)器
{$text|變量調(diào)節(jié)器名稱:參數(shù)1:參數(shù)2}
*}
{$php}
<hr>
{$text|nl2br}

運(yùn)行效果：

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

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參數(shù)：file????圖片資源的路徑

運(yùn)行效果：

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作用:生成一個表格，將數(shù)據(jù)遍歷進(jìn)去

示例代碼：

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

參數(shù)說明：loop????要循環(huán)遍歷的數(shù)組

???? Cols????指定表格列數(shù)

作用：生成一組多選框

示例代碼：

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

參數(shù)說明： name????????對應(yīng)多選框中的name屬性

???????? Values????對應(yīng)多選框中你的value屬性

Checked????選中指定的多選框

???????? Output????控制文本內(nèi)容

???????? Separator 連接符

運(yùn)行效果：

{待補(bǔ)充}

示例代碼：

<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>

參數(shù)說明：values???? ????下拉框選項(xiàng)的值

???? Selected????指定被選中的下拉選項(xiàng)，注意：必須和value的值對應(yīng)

???????? Output????輸出的文本

9、html_radios自定義函數(shù)

示例代碼：

<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>

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參數(shù)說明：values????單選框的值

???????? Checked????指定默認(rèn)被選中的單選框

???????? Output????輸出的文本

???????? Separator????連接符

運(yùn)行效果：

{待補(bǔ)充}

實(shí)例代碼：

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

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SMARTY_DIR

• $template_dir????????模板目錄????默認(rèn)是：templates
• $compile_dir????????編譯目錄????默認(rèn)是：templates_c
• $config_dir????????配置目錄????默認(rèn)：configs
• $cache_dir????????緩存目錄????默認(rèn):cache
• $left_delimiter????左定界符????默認(rèn)：{
• $right_delimiter????右定界符????默認(rèn)：}

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以上變量都有默認(rèn)行為。

• $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.

• 在模板中獲取數(shù)組內(nèi)容：

{*多維數(shù)組*}
{$var[0]['name']}
{*一位數(shù)組*}
{$var['name']}

• 在模板中獲取對象內(nèi)容

{*獲取對象屬性*}
{$std->name}
<hr>
{*獲取對方法*}
{$person->speak()}

Index3.php文件

$std = new StdClass();
class person{
function __construct(){}
function speak(){
echo '你猜猜我誰?';
}
}
$person = new person();
$std->name = '張二明';

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概念：一般在我們項(xiàng)目中，有一部分?jǐn)?shù)據(jù)并不是實(shí)時更新的，但是，有又必須實(shí)時訪問。如果不使用緩存技術(shù)的話，每訪問一次，得查詢一次或者多次數(shù)據(jù)庫，那么會給數(shù)據(jù)造成很高的I/O開銷。會增加服務(wù)器的壓力。

用戶端緩存原理：

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服務(wù)器緩存原理：

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//開啟緩存
$Smarty->caching = true;

//設(shè)置緩存文件的生命周期
$Smarty->cache_lifetime = '7200';

緩存文件由編譯文件而來。

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編譯文的內(nèi)容何時變化？

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思路：設(shè)置一個生命周期只有30秒的緩存文件，定義一個變量，在模板中使用該變量。然后打開index.php.

然后修改該變量的值。等待。。。30

Smarty緩存相關(guān)細(xì)節(jié)

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

• 基本語法：isCached(templatesName); 檢測模板文件的緩村文件是否存在
• 參數(shù)說明：模板文件名稱

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

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在Smarty的緩村是全局緩存，如果開啟緩存，訪問整個頁面的數(shù)據(jù)都會被緩存，如果頁面中有一些動態(tài)數(shù)據(jù)需要修改，如何處理？

如何處理頁面中動態(tài)顯示的數(shù)據(jù)部分呢？

<code><span><strong><span>$Smarty<span>->assign(<span>'shige'<span>,<span>'</span></span></span></span></span>《再別康橋》<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>

如何解決一個模板文件，動態(tài)顯示不同的內(nèi)容。

實(shí)際場景：譬如一個電商網(wǎng)站的商品詳細(xì)頁，會動態(tài)的根據(jù)URL上的參數(shù)，改變該頁面的內(nèi)容。

那么這種情況如何實(shí)現(xiàn)緩存呢？

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

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在Smarty中，我們通過設(shè)置display()第二個參數(shù)，來實(shí)現(xiàn)，單頁面，多緩存。

11、緩存集合

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

我們通過給display（）方法設(shè)置第二個參數(shù)實(shí)現(xiàn)緩存集合（通過|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>

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五、過濾器

示例代碼：

<code><span><strong><span>//</span><span>定義一個函數(shù)用于字符串替換</span><span>
						</span></strong></span></code>

<code><span><strong><span>function <span>check<span>(<span>$tpl_output<span>, <span>$smarty<span>){<br/>
													<span>$tpl_output <span>= <em>str_replace</em>(<span>'</span></span></span></span></span></span></span></span></span></span>蒼井空<span><span>'<span>,<span>'</span></span></span>張某某<span>'<span>,<span>$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>通過注冊過濾器，實(shí)現(xiàn)模板中的字符串過濾</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>

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通過模板繼承實(shí)現(xiàn)頁面精細(xì)化拆分

示例代碼：

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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