Php performance

PHP Performance laruence [email_address] http://www.laruence.com/ 14-May-2011

Goals
Reduce file IO
Less request
Save bandwidth
Make PHP faster

Compiler Optimization
Compile PHP with –O3 flag

WebServer
Apache
Nginx
Lighttpd

Apache Optimizations
DirectoryIndex
AllowOverride
Options FollowSymLinks
Deny Allow
HostnameLookups
Keepalive
Log

Output Optimizations
Output
ob_start
output_buffer
sendBufferSize

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

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

PHP Parse Cycle
compile_file
execute

Merge Include
Reduce Opcode
Reduce File IO

Opcode Cache
apc
eaccelerator

Coding Optimization

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

Avoid Magic
__set
__get
__call

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

Use Include instead of Include_once
1 hash lookup

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

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

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(“/[a8f9]/", "sometext")
strpbrk("a8f9", "sometext")
preg_match("!string!i", "text") stripos("text", "string")
?>

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

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++) {}

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;
?>

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() {}
}

Shorten names
$product_car_price_in_doller
Function getTheUserFamilyAdress
Class PersonWhoHaveGun

Use PHP’s functions
Internal Functions
Pcel Extensions
Pear

Any Other ideas?

Execute Method
Call
Swith
Goto

Contents Cache
File
Session
Memecache
Expire time

Use PHP Extension
C
Avoid Compile
Avoid Zend VM

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

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Php performance

by Laruence Hui on May 31, 2011

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Php performance — Presentation Transcript