_php Tutorials for improving PHP program performance and load testing

An example of how to improve the performance of PHP program and load test code, the need for friends can see how to improve the performance of their programs oh.

Calculate the time of execution
The following simple method can be used to calculate the execution time of a program (subtle)

The code is as follows

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$start _time = Microtime (true); Some code that needs to calculate time ... code here ... Print (' Code run Time is: '. Getexectime ($start _time)); function Getexectime ($start _time) { Return Microtime (True)-$start _time; }pear's benchmark module provides a more detailed time-counting function Require_once ' benchmark/timer.php '; $timer =& New Benchmark_timer (true); $timer->start (); Set 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 the code here $timer->stop (); $timer->display (); Declare structure and ticks directives enable automatic recording of the time each line of PHP code executes A function that records the time if it is called function profile ($dump = FALSE) { Static $profile; Return The Times stored in profiles, then erase it if ($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 < + + $x) { Echo Similar_text (MD5 ($x), MD5 ($x * $x)), ";"; } } Display the data stored in the profiler Print_r (TRUE); Note: The ticks Directive is obsolete in PHP 5.3.0 and will be removed from the PHP 6.0.0.

Code troubleshooting
The main introduction is Advanced PHP Debugger (APD), through the setup can generate trace files, the file analysis can get the details of the script

Website Stress test
Stress tests and benchmark tests are often confused. Benchmarking is a temporary activity done by a single developer, commonly used by the Apache HTTP Test tool--ab, which tests the number of requests per second that an HTTP server can have. Stress testing is a test technique that interrupts your Web application by testing breakpoints to identify and fix weaknesses in your application and provide a basis for when to acquire new hardware. The common open Source tool is siege.

Speed up skills
By installing the PHP accelerator, you can effectively provide PHP execution speed, the three most common accelerators are alternative PHP Cache (APC), eaccelerator, and Ioncube php Accelerator (PHPA). It is also important to note that the compatibility of accelerators usually lags behind the newly released PHP version.

In addition, the speed-up technique is not used when you can not use the regular, usually alternative solutions are more efficient than the use of regular.

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