HProf是facebook开源出来的一个php轻量级的性能分析工具,跟Xdebug类似,但性能开销更低,还可以用在生产环境中,也可以由程序开关来控制是否进行profile。基于浏览
器的性能分析用户界面能更容易查看,或是与同行们分享成果。也能绘制调用关系图。在数据收集阶段,它记录调用次数的追踪和包容性的指标弧在动态callgraph的一个程序。
它独有的数据计算的报告/后处理阶段。在数据收集时,XHProfd通过检测循环来处理递归的函数调用,并通过给递归调用中每个深度的调用一个有用的命名来避开死循环。
XHProf的轻量级性质和汇聚功能,使得它非常适合用于收集“生产环境”的性能统计数据的统计。
1. 安装XHProf
代码如下:
wget http://pecl.php.net/get/xhprof-0.9.2.tgz
tar zxf xhprof-0.9.2.tgz
cd xhprof-0.9.2
cp -r xhprof_html xhprof_lib
cd extension
phpize
./configure
make
make install
2. 配置 php.ini 文件
代码如下:
[xhprof]
extension=xhprof.so
;
; directory used by default implementation of the iXHProfRuns
; interface (namely, the XHProfRuns_Default class) for storing
; XHProf runs.
; 记得
xhprof.output_dir=
重启服务让修改生效,现在就可以使用XHProf了,不过为了显示效果更炫,最好继续安装Graphviz。
3. 安装Graphviz
代码如下:
wget http://www.graphviz.org/pub/graphviz/stable/SOURCES/graphviz-2.26.3.tar.gz
tar zxf graphviz-2.26.3.tar.gz
cd graphviz-2.26.3
./configure
make
make install
安装完成后,会生成/usr/local/bin/dot文件,你应该确保路径在PATH环境变量里,以便XHProf能找到它。
4. 应用XHProf
代码如下:
xhprof_enable();//打开xhprof
/******程序逻辑 Start******/
function test1(){
sleep(3);
return;
}
function test2(){
test1();
}
function test3(){
test2();
}
function p(){
echo '
xhprof test
';}
p();
test3();
/******程序逻辑 End******/
$xhprof_data = xhprof_disable();//关闭xhprof
//保存xhprof数据
include_once '../xhprof_lib/utils/xhprof_lib.php';
include_once '../xhprof_lib/utils/xhprof_runs.php';
$xhprof_runs = new XHProfRuns_Default();
$xhprof_source = 'xhprof_test';
$run_id = $xhprof_runs->save_run($xhprof_data, $xhprof_source);
$report_url = 'http://xhprof.rebill.info/index.php?run='.$run_id.'&source='.$xhprof_source;
echo '
';
echo 'view the performance report:'.$report_url.'';
如此一来,会在上面设定的xhprof.output_dir目录里生成名字类似4c236583ef490.xhprof_test的数据文件,可以很方便的通过Web方式浏览效果:
http://xhprof.rebill.info/index.php?run=4c236583ef490&source=xhprof_test
目前显示的是表格形式的显示,点击页面上的[View Full Callgraph],就能看到精美的图片显示了。
在线测试体验地址:http://xhprof.rebill.info/test.php

PHP remains important in modern web development, especially in content management and e-commerce platforms. 1) PHP has a rich ecosystem and strong framework support, such as Laravel and Symfony. 2) Performance optimization can be achieved through OPcache and Nginx. 3) PHP8.0 introduces JIT compiler to improve performance. 4) Cloud-native applications are deployed through Docker and Kubernetes to improve flexibility and scalability.

PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.

PHP and Python each have their own advantages and are suitable for different scenarios. 1.PHP is suitable for web development and provides built-in web servers and rich function libraries. 2. Python is suitable for data science and machine learning, with concise syntax and a powerful standard library. When choosing, it should be decided based on project requirements.

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The reasons why PHP is the preferred technology stack for many websites include its ease of use, strong community support, and widespread use. 1) Easy to learn and use, suitable for beginners. 2) Have a huge developer community and rich resources. 3) Widely used in WordPress, Drupal and other platforms. 4) Integrate tightly with web servers to simplify development deployment.

PHP remains a powerful and widely used tool in modern programming, especially in the field of web development. 1) PHP is easy to use and seamlessly integrated with databases, and is the first choice for many developers. 2) It supports dynamic content generation and object-oriented programming, suitable for quickly creating and maintaining websites. 3) PHP's performance can be improved by caching and optimizing database queries, and its extensive community and rich ecosystem make it still important in today's technology stack.

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The \_\_invoke method allows objects to be called like functions. 1. Define the \_\_invoke method so that the object can be called. 2. When using the $obj(...) syntax, PHP will execute the \_\_invoke method. 3. Suitable for scenarios such as logging and calculator, improving code flexibility and readability.


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