


很多博客软件都有这么一个功能,比如“生成本次页面一共花费了xx毫秒,进行了xx次数据库查询”等等。那么这个功能是如何实现的呢,下面我大概说下思路。
1. 在类的构造函数中声明全局变量
定义一个全局变量 $queries 用来统计页面生成经过的数据库查询次数。
function __construct() { parent::__construct(); global $queries; }
2. 修改数据库类中封装好的的 query()
你应该有用到数据库类吧,找到它封装 query() 的方法,比如下面的:
// 执行SQL语句 public function query($query) { //echo $query.'<br />'; ++$GLOBALS['queries']; return $this->result = mysql_query($query, $this->link); }
那么每执行一次 Query,全局变量 queries 就会自增1。
3. 在方法体中这样写:
public function content($id = 0) { $GLOBALS['queries'] = 0; // something to do echo $GLOBALS['queries']; }
就这么简单就能实现那个功能了。
4. 附带计算PHP脚本执行的函数
之前写的博文介绍了下计算PHP脚本执行时间的函数,这里再贴一下吧。
// 计时函数 public function runtime($mode = 0) { static $t; if(!$mode) { $t = microtime(); return; } $t1 = microtime(); //list($m0,$s0) = split(" ",$t); list($m0,$s0) = explode(" ",$t); //list($m1,$s1) = split(" ",$t1); list($m1,$s1) = explode(" ",$t1); return sprintf("%.3f ms",($s1+$m1-$s0-$m0)*1000); }
使用如下:
public function content($id = 0) { $this -> runtime(); $GLOBALS['queries'] = 0; // something to do echo $GLOBALS['queries']; echo $this -> runtime(1); }

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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