1.首先我们安装xhprof:
yum install xhprof
2.安装好之后,找到xhprof的配置文件xhprof.conf,一般会在/etc/php.d里面,加入这2行:
extension=xhprof.soxhprof.output_dir=<directory_for_storing_xhprof_runs>
3.如果要图形话,需要安装dot(可选):
yum install graphviz
4.安装好之后重启一下服务器:
service httpd restart
5.使用的话只要包含以下文件代码即可:
#在php的头部加上,可以设置记录频率,比如记录万分之一xhprof_enable(XHPROF_FLAGS_CPU + XHPROF_FLAGS_MEMORY);
#在代码页的底部加上if ($xhprof_flag) { $xhprof_data = xhprof_disable(); include_once "./xhprof_lib/utils/xhprof_lib.php"; include_once "./xhprof_lib/utils/xhprof_runs.php"; $xhprof_runs = new XHProfRuns_Default(); $xhprof_runs->save_run($xhprof_data, 'xhprof',"index_".time());}
上面的xhprof_lib,php和xhprof_runs.php这2个文件的路径要改成自己的路径,千万不要写错,如果找不到这两个文件,可以使用指令 whereis xhprof 该指令会把xhprof相关的路径都罗列出来,你可以一一查询。?
6.把xhprof_html文件夹拷贝到你的web服务器根目录下,用来访问那些生成的文件;当有该php的访问时,会在

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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