PHP Performance

1. PHP Performance laruence me@laruence.com http://www.laruence.com/ 14-May-2011

2. Goals • Reduce file IO • Less request • Save bandwidth • Make PHP faster

3. Compiler Optimization • Compile PHP with –O3 flag

4. WebServer • Apache • Nginx • Lighttpd

5. Apache Optimizations • DirectoryIndex • AllowOverride • Options FollowSymLinks • Deny Allow • HostnameLookups • Keepalive • Log

6. Output Optimizations • Output • ob_start • output_buffer • sendBufferSize

7. Reduce Request • Use Css instead of style • Minifiy Javascript/Css • Merge Javascript/Css • Css sprite

8. Save Bandwidth • Freedomain Cookie • strip blank/comment in html • strip blank/comment in javascript/css • expire time for static content • compress content • Apache mod_gizp/mod_deflate • PHP zlib.output_compress

9. PHP Parse Cycle • compile_file • execute

10. Merge Include • Reduce Opcode • Reduce File IO

11. Opcode Cache • apc • eaccelerator

12. Coding Optimization

13. Prefer Use Static Methods <?php class Test { public function a() { } public static function b() { } } ?> • 1:4

14. Avoid Magic • __set • __get • __call

15. Avoid Function calls • time() - $_SERVER[REQUEST_TIME] • phpversion() - PHP_VERSION • get_class() - __CLASS__ • is_null() - NULL === • strlen($str) > 5 – isset($str{5}) • print() - echo

16. Use Include instead of Include_once • 1 hash lookup

17. @ is evil @func() $old = ini_set(“error_reporting”, 0); func(); ini_set(“error_reporting”, $old);

18. Less memory usage • Use non-capturing Regex • preg_replace('"/(?:\n|\t|\r\n|\s)+/"', ' ', $origtext ); • avoid tmp variable • strncmp(PHP_OS, 'WIN', 3) • substr(PHP_OS, 0, 3) == 'WIN‘ • unset variable after use

19. PCRE is slow <?php preg_replace( "/\n/", "\\n", $text); str_replace( "/\n/", "\\n", $text); preg_match(“/^foo_/i", "FoO_") !strncasecmp("foo_", "FoO_", 4) preg_match(“/[abce]/", “string") strpbrk(“string", “abcd") preg_match("!string!i", "text")stripos("text", "string") ?>

20. Do not mis-use Constants <?php $array = array(“foo” => “bar”); echo $array[foo] ?> • Try constant • E_NOTICE • Create Tmp String • 1:7.5

21. Do not multi-call function in for loop <?php for ($i=0; $i < count($array); $i++) {} ?> • Instead <?php for ($i=0, $j=count($array); $i<$j; $i++) {}

22. Use Reference <?php $a[1][2] = array(); for($i = 0; $i < 10; $i++) $a[1][2][$i] = $i; ?> • Instead <?php $ref =& $a[1][2]; for($i = 0; $i < 10; $i++) $ref[$i] = $i; ?>

23. Do Work for PHP • Use full path in require/include • Inlucde “2.php” • Include “/home/huixinchen/phpsrc/2.php” • Less include path • Use instant instead of variable <?php class test { public static function instance() { return new self(); } private function __construct() {} }

24. Shorten names • $product_car_price_in_doller • Function getTheUserFamilyAdress • Class PersonWhoHaveGun

25. Use PHP’s functions • Internal Functions • Pcel Extensions • Pear

26. Any Other ideas?

27. Execute Method • Call • Swith • Goto

28. Contents Cache • File • Session • Memecache • Expire time

29. Use PHP Extension • C • Avoid Compile • Avoid Zend VM

30. Profiling & Benchmarking • WebServer • ab • http_load • PHP • apd • xdebug • Mysql • explain • profile

31. Q&A