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

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
PHP
Exprs
Opcodes
Output

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 avoid tmp variable unset variable after use
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); $i++) {}
?>
Instead
for ($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
$ref =& $a[1][2];
$ref[$i] = $i;

23. Do Work for PHP Use full path in require/include Less include path
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