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PHP template engine Smarty built-in function foreach, foreachelse usage analysis, smartyforeachelse_PHP tutorial
PHP template engine Smarty built-in function foreach, foreachelse usage analysis, smartyforeachelse_PHP tutorial
Jul 12, 2016 am 08:54 AM
Usage analysis of PHP template engine Smarty's built-in functions foreach and foreachelse, smartyforeachelse
This article describes the usage of PHP template engine Smarty's built-in functions foreach and foreachelse. Share it with everyone for your reference, 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, they all do the same thing, which is to iterate over the contents of an 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 list below for its parameters:
| property | Type | Is it necessary | Default value | Description | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| from | string | Yes | n/a | Name of the array to be looped | |||||||||||||||||||||||||
| item | string | Yes | n/a | Variable name of the currently processed element | |||||||||||||||||||||||||
| key | string | No | n/a |
Key name of the currently processed element
|
|||||||||||||||||||||||||
| name | string | No | n/a | The name of the loop, 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 this array variable to the template, and then traverse the array in the template
test.sql (SQL data used)
-- -- 表的結(jié)構(gòu) `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 '0000-00-00 00:00:00', PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=7 ; -- -- 轉(zhuǎn)存表中的數(shù)據(jù) `user` -- INSERT INTO `user` (`id`, `username`, `email`, `addTime`) VALUES (1, '蒼井空', 'canjingkong@sina.com.cn', '2011-10-24 00:00:00'), (2, '櫻木花道', 'ymhd@163.com', '2011-10-24 00:00:00'), (3, '赤木晴子', 'chimiqingzi@yahoo.com,cn', '2011-10-24 00:00:00'), (4, '流川楓', 'lcfeng@sina.com', '0000-00-00 00:00:00'), (5, '蠟筆小新', 'labixiaoxin@sina.com', '2011-10-24 00:00:00'), (6, '金剛葫蘆娃', 'jghlw@sina.com', '2011-10-24 00:00:00');
init.inc.php (template initialization file)
<?php
define('ROOT_PATH', dirname(__FILE__)); //設(shè)置網(wǎng)站根目錄
require ROOT_PATH.'/libs/Smarty.class.php'; //加載 Smarty 模板引擎
$_tpl = new Smarty(); //創(chuàng)建一個(gè)實(shí)例對(duì)象
$_tpl->template_dir = ROOT_PATH.'/tpl/'; //重新指定模板目錄
$_tpl->compile_dir = ROOT_PATH.'./com/'; //重新指定編譯目錄
$_tpl->left_delimiter = '<{'; //重新指定左定界符
$_tpl->right_delimiter = '}>'; //重新指定右定界符
?>
index.php (main file)
<?php
require 'init.inc.php'; //引入模板初始化文件
global $_tpl;
$_mysqli = new mysqli(); //創(chuàng)建一個(gè) mysqli() 對(duì)象
$_mysqli->connect('localhost','root','數(shù)據(jù)庫(kù)密碼','數(shù)據(jù)庫(kù)名'); //連接數(shù)據(jù)庫(kù)，請(qǐng)您自行設(shè)置
$_mysqli->set_charset('utf8'); //設(shè)置編碼
$_result = $_mysqli->query("select username,email,addTime from user order by id asc");
$_html = array();
while (!!$_row=$_result->fetch_assoc()) {
$_html[] = $_row;
}
$_tpl->assign('data',$_html); //把數(shù)組分配到模板中
$_tpl->display('index.tpl'); //引入模板
$_mysqli->close(); //關(guān)閉數(shù)據(jù)庫(kù)，釋放資源
?>
tpl/index.tpl (template file of the main file index.php)
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>foreach,foreachelse</title>
</head>
<body>
<table align="center" border="1" width="800">
<{foreach from=$data item="row" name="ls"}> <!-- 這個(gè)foreach 循環(huán)分配過(guò)來(lái)的數(shù)組有幾行數(shù)據(jù) -->
<!-- 在此，我們做幾個(gè)保留變量 $smarty.foreach 的操作 -->
<!-- 當(dāng)數(shù)據(jù)顯示第一條的時(shí)候，第一行的表格背景為黃色，使用屬性：first -->
<!-- 當(dāng)數(shù)據(jù)顯示最后一條的時(shí)候，最后一行的表格背景為藍(lán)色,使用屬性：last -->
<!-- 顯示下分配過(guò)來(lái)的數(shù)組的總個(gè)數(shù)，使用屬性：total -->
<{if $smarty.foreach.ls.first}>
<tr bgcolor="#FFFF00"> <!-- 第一行背景為黃色 -->
<{elseif $smarty.foreach.ls.last}>
<tr bgcolor="#0000FF"> <!-- 最后一行背景為藍(lán)色 -->
<{else}>
<tr>
<{/if}>
<td><{$smarty.foreach.ls.iteration}></td><!-- 注意：這里是保留變量 $smarty.foreach 的使用，iteration：總是從 1 開(kāi)始，每執(zhí)行一次增加 1 -->
<{foreach from=$row item="col" name="lsin"}> <!-- 這個(gè)foreach 循環(huán)數(shù)組內(nèi)的內(nèi)容，顯示在表格的<td></td>標(biāo)簽里 -->
<td><{$col}></td>
<{/foreach}>
</tr>
<{foreachelse}> <!-- 如果分配過(guò)來(lái)的數(shù)組中沒(méi)有數(shù)據(jù)，那么就執(zhí)行下面的操作！ -->
<tr>
<td>對(duì)不起！暫時(shí)沒(méi)有數(shù)據(jù)。</td>
</tr>
<{/foreach}>
<tr>
<td colspan="4" align="center">分配數(shù)組的總記錄數(shù)為：<{$smarty.foreach.ls.total}>條</td>
</tr>
</table>
</body>
</html>
Execution result:
Finally, the array $_html passed in the main file index.php 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)
Readers who are interested in more PHP-related content can check out the special topics of this site: "Basic Tutorial for Getting Started with Smarty Templates", "Summary of PHP Template Technology", "Summary of PHP Database Operation Skills Based on PDO", "PHP Operations and Operators" Usage summary", "PHP network programming skills summary", "PHP basic syntax introductory tutorial", "php object-oriented programming introductory tutorial", "php string (string) usage summary", "php mysql database operation introductory tutorial" and "Summary of Common Database Operation Skills in PHP"
I hope this article will be helpful to everyone’s PHP program design based on smarty templates.
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