Backend Development
PHP Tutorial
Usage and example analysis of PHP template engine Smarty custom variable mediator
Usage and example analysis of PHP template engine Smarty custom variable mediator
This article mainly introduces the usage of the PHP template engine Smarty custom variable mediator. It analyzes the usage of the smarty variable mediator and the implementation skills of the custom variable mediator in more detail. Friends who need it can refer to it
In PHP, there are many functions for processing text. You can process the text to be processed through the function, then call assign() in the Smarty template engine to assign the value to a variable, and assign it to the template for display.
The variable mediator in Smarty is similar to the text processing function in PHP, but the syntax is different. In Smarty, it is directly followed by the mediator function name through "|". If there are parameters, It must be added after ":". If there are multiple parameters, just add them up.
Format: {$var|modifier1:"Parameter1":"Parameter2":Parameter3|modifier2|modifier3|...}
Define the moderator The file must be placed in Smarty, the specific path is: libs/plugins/. The file name must be in the format of Smarty modifier.mediatorname.php
The following demonstrates the use of custom variable moderators in Smarty through an example
Programming idea: Make two variables The function of the mediator is: one to convert text; one to intercept text.
init.inc.php(Smarty initialization file)
<?php
define('ROOT_PATH', dirname(__FILE__)); //设置网站根目录
require ROOT_PATH.'/libs/Smarty.class.php'; //加载 Smarty 模板引擎
$_tpl = new Smarty(); //创建一个实例对象
$_tpl->template_dir = ROOT_PATH.'/tpl/'; //设置模板文件目录
$_tpl->compile_dir = ROOT_PATH.'./com/'; //设置编译文件目录
$_tpl->left_delimiter = '<{'; //设置左定界符
$_tpl->right_delimiter = '}>'; //设置右定界符
?>index.php(main file)
<?php define('CONST_VAR', 'ABC'); require 'init.inc.php'; //引入模板初始化文件 global $_tpl; $_str = 'abcdEFGHigklmnOPQRSTuvwsYz'; //定义一个字符串 $_tpl->assign('str',$_str); //字符串赋值给str $_tpl->assign('str1',strtolower($_str)); //字符串全部转换为小写赋给str1 $_tpl->assign('str2',strtoupper($_str)); //字符串全部转换为大写赋给str2 $_tpl->assign('str3',ucfirst($_str)); //字符串首字母转换为大写赋给str3 $_tpl->assign('str4',substr($_str, 0,15).'...'); //截取字符串前15个字符，后面的用'...'代替，并赋给str4 $_tpl->assign('str5',strtoupper(substr($_str, 0,15)).'...'); //截取字符串前15个字符转换为大写，后面的用'...'代替，并赋给str4 $_tpl->display('index.tpl'); //引入模板 ?>
tpl/index.tpl
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Smarty 中的变量调解器</title>
</head>
<body>
<{$str}><br /> <!-- 输出字符串原形 -->
<{$str1}><br /> <!-- 输出字符串转换为小写-->
<{$str2}><br /> <!-- 输出字符串转换为大写 -->
<{$str3}><br /> <!-- 输出字符串首字母大写 -->
<{$str4}><br /> <!-- 截取字符串，截取15个字符串，后面的用'...'代替 -->
<{$str5}><br /> <!-- 截取字符串，截取15个字符串，转换为大写，后面的用'...'代替 -->
<!--
您会发现，使用赋值过来的变量，使用起来不是很灵活，
如果需要处理字符串，就必须得在主文件中设立一个新变量，并把值赋给这个新变量。
使用变量调解器，可灵活的处理字符串
-->
<{$str|transform}><br /> <!-- 输出字符串原形-->
<{$str|transform:"lower"}><br /> <!-- 输出字符串转换为小写-->
<{$str|transform:"upper"}><br /> <!-- 输出字符串转换为大写 -->
<{$str|transform:"firstdx"}><br /> <!-- 输出字符串首字母大写 -->
<{$str|subString:0:15:"###"}><br /> <!-- 截取字符串，截取15个字符串，后面的用'###'代替 -->
<{$str|subString:0:15:"@@@"|transform:"upper"}><br /> <!-- 截取字符串，截取15个字符串，后面的用'@@@'代替 -->
<{$str|transform:"upper"|subString:0:15:"@@@"}><br /> <!-- 功能同上 -->
</body>
</html>/libs/plugins/modifier.transform.php(Transform File Modifier )
<?php
/**
* smarty_modifier_transform
* 字符串转换的变量调解器函数
* @param string $string 处理字符串
* @param string $type 处理类型
*/
function smarty_modifier_transform($string,$type) {
switch ($type) {
case 'upper' :
$str = strtoupper($string);
break;
case 'lower' :
$str = strtolower($string);
break;
case 'firstdx' :
$str = ucfirst($string);
break;
default:
$str = $string;
}
return $str;
}
?>lib/plugins/modifier.subString.php(Interception text modifier)
<?php
/**
* smarty_modifier_subString
* 处理截取字符串调解器
* @param string $string 处理字符串
* @param int $start_num 开始位置，默认从头开始
* @param int $end_num 结束位置，默认20
* @param string $addTo 追加字符串，默认'...'
*/
function smarty_modifier_subString($string,$start_num=0,$end_num=20,$addTo='...') {
$_str = '';
if (strlen(substr($string, $start_num, $end_num))>=$end_num) {
$_str = substr($string, $start_num, $end_num).$addTo;
} else {
$_str = substr($string, $start_num, $end_num);
}
return $_str;
}
?>Execution results:
Through the above example, it is shown that the mediator file must be placed under Smarty’s plug-in directory plugins, and the naming must follow Smarty’s rules, so , the mediator function you wrote can be called. Another point to note is that the defined function name must also comply with Smarty's default naming rules, for example: smarty_modifier_XXX, and a modifier file can only contain one function, not multiple.
Summary: The above is the entire content of this article, I hope it will be helpful to everyone's study.
Related recommendations: The definition and usage of the htmlentities() function in
PHP Methods and simple examples of generating verification codes that can be clicked to refresh
The above is the detailed content of Usage and example analysis of PHP template engine Smarty custom variable mediator. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1378
52
PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian
Dec 24, 2024 pm 04:42 PM
PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati
How To Set Up Visual Studio Code (VS Code) for PHP Development
Dec 20, 2024 am 11:31 AM
Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c
7 PHP Functions I Regret I Didn't Know Before
Nov 13, 2024 am 09:42 AM
If you are an experienced PHP developer, you might have the feeling that you’ve been there and done that already.You have developed a significant number of applications, debugged millions of lines of code, and tweaked a bunch of scripts to achieve op
How do you parse and process HTML/XML in PHP?
Feb 07, 2025 am 11:57 AM
This tutorial demonstrates how to efficiently process XML documents using PHP. XML (eXtensible Markup Language) is a versatile text-based markup language designed for both human readability and machine parsing. It's commonly used for data storage an
Explain JSON Web Tokens (JWT) and their use case in PHP APIs.
Apr 05, 2025 am 12:04 AM
JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,
PHP Program to Count Vowels in a String
Feb 07, 2025 pm 12:12 PM
A string is a sequence of characters, including letters, numbers, and symbols. This tutorial will learn how to calculate the number of vowels in a given string in PHP using different methods. The vowels in English are a, e, i, o, u, and they can be uppercase or lowercase. What is a vowel? Vowels are alphabetic characters that represent a specific pronunciation. There are five vowels in English, including uppercase and lowercase: a, e, i, o, u Example 1 Input: String = "Tutorialspoint" Output: 6 explain The vowels in the string "Tutorialspoint" are u, o, i, a, o, i. There are 6 yuan in total
Explain late static binding in PHP (static::).
Apr 03, 2025 am 12:04 AM
Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.
What are PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases?
Apr 03, 2025 am 12:03 AM
What are the magic methods of PHP? PHP's magic methods include: 1.\_\_construct, used to initialize objects; 2.\_\_destruct, used to clean up resources; 3.\_\_call, handle non-existent method calls; 4.\_\_get, implement dynamic attribute access; 5.\_\_set, implement dynamic attribute settings. These methods are automatically called in certain situations, improving code flexibility and efficiency.
