Improve PHP program performance and load testing_PHP tutorial

An example code about improving the performance and load testing of PHP programs. Friends in need can take a look at how to improve the performance of their own programs.

Calculate execution time
Use the following simple method to calculate the execution time of a program (subtle)

return microtime(true)-$start_time;}PEAR’s Benchmark module provides a more detailed time statistics function

The code is as follows

代码如下

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$start_time = microtime(true); //一些需要计算时间的代码 //... code here ... print('代码的运行时间是：'.getExecTime($start_time)); function getExecTime($start_time) {  return microtime(true)-$start_time; }PEAR的Benchmark模块提供了更详细的时间统计功能 require_once 'Benchmark/Timer.php'; $timer =& new Benchmark_Timer(true); $timer->start(); // 设置函数 $timer->setMarker('setup'); // some more code executed here $timer->setMarker('middle'); // even yet still more code here $timer->setmarker('done'); // and a last bit of code here $timer->stop(); $timer->display();通过declare结构和ticks指令可以实现自动记录每一行PHP代码执行的时间 // A function that records the time when it is called function profile($dump = FALSE) {     static $profile;     // Return the times stored in profile, then erase it     if ($dump) {         $temp = $profile;         unset($profile);         return ($temp);     }     $profile[] = microtime(); } // Set up a tick handler register_tick_function("profile"); // Initialize the function before the declare block profile(); // Run a block of code, throw a tick every 2nd statement declare(ticks=2) {     for ($x = 1; $x         echo similar_text(md5($x), md5($x*$x)), ";";     } } // Display the data stored in the profiler print_r(profile (TRUE));注意：ticks 指令在 PHP 5.3.0 中是过时指令，将会从 PHP 6.0.0 移除。

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$start_time = microtime(true);

//Some Code that needs to calculate time

//... code here...

print('The running time of the code is:'.getExecTime($start_time));

function getExecTime ($start_time)

{

require_once 'Benchmark/Timer.php' ;$timer =& new Benchmark_Timer(true);

$timer->start();

// Setup function$timer->setMarker('setup');// some more code executed here$timer->setMarker('middle');// even yet still more code here$timer->setmarker('done');// and a last bit of code here$timer->stop();$timer->display(); Automatically record each line of PHP code execution through the declare structure and ticks instructions The time// A function that records the time when it is calledfunction profile($dump = FALSE){

static $profile; // Return the times stored in profile, then erase it

if ($dump) {

$temp = $profile; unset($profile); return ($temp); } $profile[] = microtime();}// Set up a tick handlerregister_tick_function("profile");// Initialize the function before the declare blockprofile();// Run a block of code, throw a tick every 2nd statementdeclare(ticks=2) { for ($ x = 1; $x               echo similar_text(md5($x), md5($x*$x)), ";"; // Display the data stored in the profilerprint_r(profile (TRUE)); Note: The ticks directive is an obsolete directive in PHP 5.3.0 and will be removed from PHP 6.0.0. Code troubleshootingThe main introduction is Advanced PHP Debugger (APD), which can generate tracking files through settings, and analyze the files to get detailed information about the scriptWebsite Stress TestingPeople often confuse stress testing and benchmarking. Benchmark testing is a temporary activity completed by an individual developer. The commonly used Apache HTTP testing tool - ab, which can test the number of requests an HTTP server can respond to per second. Stress testing is a testing technology that can interrupt your WEB application. By testing breakpoints, weaknesses in the application can be identified and repaired, providing a basis for when to purchase new hardware. A commonly used open source tool is Siege. Speed-up tipsBy installing a PHP accelerator, you can effectively improve the execution speed of PHP. The three common accelerators are Alternative PHP Cache (APC), eAccelerator and ionCube PHP Accelerator (PHPA). Another thing to note is that accelerator compatibility often lags behind newly released PHP versions. Another speed-up trick is to try not to use regular expressions when you can. Usually alternative solutions are more efficient than using regular expressions. http://www.bkjia.com/PHPjc/444723.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/444723.htmlTechArticleAn example code about improving PHP program performance and load testing. Friends in need can take a look at how to improve themselves. Program performance. Calculate the execution time through the following simple...