通常volist标签多用于查询数据集(select方法)的结果输出,通常模型的select方法返回的结果是一个二维数组,对此可以直接使用volist标签进行输出。
在控制器中首先对模版赋值,如下例所示:
$User = M('User'); $list = $User->limit(10)->select(); $this->assign('list',$list);
在模版定义如下,循环输出用户的编号和姓名:
<volist name="list" id="vo"> {$vo.id}:{$vo.name}<br/> </volist>
Volist标签的name属性表示模板赋值的变量名称,因此不可随意在模板文件中改变。id表示当前的循环变量,可以随意指定,但需要确保不要和name属性冲突,例如:
<volist name="list" id="data"> {$data.id}:{$data.name}<br/> </volist>
支持输出查询结果中的部分数据,例如输出其中的第5~15条记录:
<volist name="list" id="vo" offset="5" length='10'> {$vo.name} </volist>
输出偶数记录:
<volist name="list" id="vo" mod="2" > <eq name="mod" value="1"> {$vo.name} </eq> </volist>
Mod属性还用于控制一定记录的换行,例如:
<volist name="list" id="vo" mod="5" > {$vo.name} <eq name="mod" value="4"><br/></eq> </volist>
为空的时候输出提示:
<volist name="list" id="vo" empty="暂时没有数据" > {$vo.id}|{$vo.name} </volist>
empty属性不支持直接传入html语法,但可以支持变量输出,例如:
$this->assign('empty','<span class="empty">没有数据</span>'); $this->assign('list',$list);
然后在模板中使用:
<volist name="list" id="vo" empty="$empty" > {$vo.id}|{$vo.name} </volist>
输出循环变量:
<volist name="list" id="vo" key="k" > {$k}.{$vo.name} </volist>
如果没有指定key属性的话,默认使用循环变量i,例如:
<volist name="list" id="vo" > {$i}.{$vo.name} </volist>
如果要输出数组的索引,可以直接使用key变量,和循环变量不同的是,这个key是由数据本身决定,而不是循环控制的,例如:
<volist name="list" id="vo" > {$key}.{$vo.name} </volist>
模板中可以直接使用函数设定数据集,而不需要在控制器中给模板变量赋值传入数据集变量,如:
<volist name=":fun('arg')" id="vo"> {$vo.name} </volist>

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software