Usage code examples of foreach and foreachelse in Smarty templates-PHP Tutorial-php.cn

Usage code examples of foreach and foreachelse in Smarty templates

伊谢尔伦

Release： 2023-03-11 09:02:01

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Mainly introduces the use of PHPtemplate engineSmarty's built-in functions foreach and foreachelse, and analyzes the functions and specific usage techniques of foreach and foreachelse in the form of examples. The details are as follows:

In Smarty templates, you can use foreach to repeat a block. In the template, an array needs to be allocated from PHP. This array can be a multidimensional array. The {foreach} tag in Smarty is the same as the foreach in PHP, except that one of them is used in the template file and the other is used in the PHP script. Therefore, the syntax will be different. However, their function is the same, that is, traverse the contents of the array . There is also a {foreachelse} tag opposite to the {foreach} tag. The function of the {foreachelse} tag is: if the array is empty, then the content in the tag is executed. {foreach} and {/foreach} must appear in pairs in the template. It has four parameters, of which two parameters from and item are necessary. Please see the following list for its parameters:

Attribute	Type	Is it required	Default value	Description
from	string	Yes	n/a	The name of the array to be looped
item	string	Yes	n/a	The variable name of the currently processed element
key	string	No	n/a	The key name of the currently processed element
name	string	No	n/a	The loop Name, used to access the loop

We use an example to demonstrate the use of {foreach} and {foreachelse} in Smarty.

Example idea: retrieve the content from the database, assign it to an array variable $_html, then assign the array variable to the template, and then traverse the array in the template

test.sql (SQL data used)

--
-- 表的结构 `user`
--
CREATE TABLE IF NOT EXISTS `user` (
 `id` mediumint(8) unsigned NOT NULL auto_increment,
 `username` varchar(50) NOT NULL,
 `email` varchar(50) NOT NULL,
 `addTime` datetime NOT NULL default &#39;0000-00-00 00:00:00&#39;,
 PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=7 ;
--
-- 转存表中的数据 `user`
--
INSERT INTO `user` (`id`, `username`, `email`, `addTime`) VALUES
(1, &#39;苍井空&#39;, &#39;canjingkong@sina.com.cn&#39;, &#39;2011-10-24 00:00:00&#39;),
(2, &#39;樱木花道&#39;, &#39;ymhd@163.com&#39;, &#39;2011-10-24 00:00:00&#39;),
(3, &#39;赤木晴子&#39;, &#39;chimiqingzi@yahoo.com,cn&#39;, &#39;2011-10-24 00:00:00&#39;),
(4, &#39;流川枫&#39;, &#39;lcfeng@sina.com&#39;, &#39;0000-00-00 00:00:00&#39;),
(5, &#39;蜡笔小新&#39;, &#39;labixiaoxin@sina.com&#39;, &#39;2011-10-24 00:00:00&#39;),
(6, &#39;金刚葫芦娃&#39;, &#39;jghlw@sina.com&#39;, &#39;2011-10-24 00:00:00&#39;);

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init.inc.php (template initialization file)

<?php
 define(&#39;ROOT_PATH&#39;, dirname(FILE)); //设置网站根目录
 require ROOT_PATH.&#39;/libs/Smarty.class.php&#39;; //加载 Smarty 模板引擎
 $_tpl = new Smarty(); //创建一个实例对象
 $_tpl->template_dir = ROOT_PATH.&#39;/tpl/&#39;; //重新指定模板目录
 $_tpl->compile_dir = ROOT_PATH.&#39;./com/&#39;; //重新指定编译目录
 $_tpl->left_delimiter = &#39;<{&#39;; //重新指定左定界符
 $_tpl->right_delimiter = &#39;}>&#39;; //重新指定右定界符
?>

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index.php (main file)

<?php
 require &#39;init.inc.php&#39;; //引入模板初始化文件
 global $_tpl;
 $_mysqli = new mysqli(); //创建一个 mysqli() 对象
 $_mysqli->connect(&#39;localhost&#39;,&#39;root&#39;,&#39;数据库密码&#39;,&#39;数据库名&#39;); //连接数据库，请您自行设置
 $_mysqli->set_charset(&#39;utf8&#39;); //设置编码
 $_result = $_mysqli->query("select username,email,addTime from user order by id asc");
 $_html = array();
 while (!!$_row=$_result->fetch_assoc()) {
  $_html[] = $_row;
 }
 $_tpl->assign(&#39;data&#39;,$_html); //把数组分配到模板中
 $_tpl->display(&#39;index.tpl&#39;); //引入模板
 $_mysqli->close(); //关闭数据库，释放资源
?>

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tpl/index.tpl (template file of the main file index.php)

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>foreach,foreachelse</title>
</head>
<body>
 <table align="center" border="1" width="800">
  <{foreach from=$data item="row" name="ls"}> <!-- 这个foreach 循环分配过来的数组有几行数据 -->
   <!-- 在此，我们做几个保留变量 $smarty.foreach 的操作 -->
   <!-- 当数据显示第一条的时候，第一行的表格背景为黄色，使用属性：first -->
   <!-- 当数据显示最后一条的时候，最后一行的表格背景为蓝色,使用属性：last -->
   <!-- 显示下分配过来的数组的总个数，使用属性：total -->
   <{if $smarty.foreach.ls.first}>
   <tr bgcolor="#FFFF00"> <!-- 第一行背景为黄色 -->
   <{elseif $smarty.foreach.ls.last}>
   <tr bgcolor="#0000FF"> <!-- 最后一行背景为蓝色 -->
   <{else}>
   <tr>
   <{/if}>
    <td><{$smarty.foreach.ls.iteration}></td><!-- 注意：这里是保留变量 $smarty.foreach 的使用，iteration：总是从 1 开始，每执行一次增加 1 -->
    <{foreach from=$row item="col" name="lsin"}> <!-- 这个foreach 循环数组内的内容，显示在表格的<td></td>标签里 -->
     <td><{$col}></td>
    <{/foreach}>
   </tr>
  <{foreachelse}> <!-- 如果分配过来的数组中没有数据，那么就执行下面的操作！ -->
   <tr>
    <td>对不起！暂时没有数据。</td>
   </tr>
  <{/foreach}>
  <tr>
   <td colspan="4" align="center">分配数组的总记录数为：<{$smarty.foreach.ls.total}>条</td>
  </tr>
 </table>
</body>
</html>

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Execution results:

Finally, to summarize, the main file index.php The array passed in $_html is a two-dimensional array. The use of reserved variables $smarty.foreach is based on the name attribute in the {foreach} tag. The reserved variable attributes used are: first (first record), last (last record), iteration (always starts from 1, Increase by 1 for each execution), total (used to display the number of loop executions)

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