PHP Without PHP—Confoo

PHP Without PHP—Confoo — Document Transcript

PHP without PHP

The Philosophy of Good Architecture

terry chay

2010-03-10T09:30+0500

Confoo

Montreal, Canada

Funky Caching

Prologue #1

aka

ErrorDocument trick

Smarter Caching

… Rasmus’s Trick (Stig’s trick)

Go into apache.conf (or .htaccess) and

ErrorDocument 404 /error.php

Error.PHP

$filepath = parse_url ( $_SERVER [ 'REQUEST_URI' ], PHP_URL_PATH ); //or $_SERVER['REDIRECT_URL']

$basepath = dirname ( __FILE__ ). DIR_SEP ;

// Test to see if you can work with it

if ( false ) { // …EDIT…

//output a 404 page

include( '404.html' ); // see http://www.alistapart.com/articles/perfect404/ for tips

return;

}

// Generate the file

// …EDIT…

$data = 'something' ;

// Don't send 404 back, send 200 OK because this is a pretty smart 404

// not a clueless one! http://www.urbandictionary.com/define.php?term =404

header ( sprintf ( '%s 200' , $_SERVER [ 'SERVER_PRO TOCOL' ]));

//Show the file

echo $data ;

//Store the page to bypass PHP on the next request. Use a temp file with a

// link trick in order to avoid race conditions between concurrent PHP

// processes.

$tmpfile = tempnam ( $basepath . 'tmp' , 'fc' );

$fp = fopen ( $tmpfile , 'w' ); //remove the "_" this is crashing my blog syntax hilighter

fputs ( $fp , $data );

fclose ( $fp );

@ link ( $basepath . $filepath , $tmpfile ); //suppress errors due to losing race

unlink ( $tmpfile );

Error.PHP

//output a 404 page

return;

}

// …EDIT…

//Show the file

echo $data ;

// processes.

fclose ( $fp );

Ceheck

Error.PHP

//output a 404 page

return;

}

// …EDIT…

//Show the file

echo $data ;

// processes.

fclose ( $fp );

PHP without PHP

Paradigms

Prologue #2

Code Complete

The metaphor of Code as construction comes from this book…

We now know this is fundamentally wrong…

Mythical Man Month

“man-month” is a term from construction work

The premise is that man and months are interchangeable.

This means that in order to reach a deadline I simply add more people to the project.

reorganize notes too much text

First consider something like painting a fence: everything is partionable (man-month).

… add a constant time for training.

… add communication cost: n(n-1)/2.

Compare to the unpartitionable (single man)

Adding people to a late project makes it later!

too much text

Engineer and Architect graphics

1 Fallingwater

organic, democratic, plasticity, continuity

…including me

Hatchway Staircase

View at the main (living room) level, from the bridge (from east)

Beyond the glass

Fallingwater: Living room terraces and glass walls (from east).

Fall Foliage

View from lookout, downstream.

Fall Foliage

View from lookout, downstream.

No barriers

Detail: corner window at the guest house, from southeast.

Existing tree

The trellis over the driveway is built to accommodate a tree.

Local quarry

Living room, west (downstream) side, from southeast

Existing boulder

Living room fireplace and hearth, looking from kitchen door to south windows

Philosophy

organic,

democratic,

plasticity,

continuity.

Why on PHP?

Harmony with Environment

Apache web server: ErrorDocument

Customer-centric: Performance paramount

Relational Database: Slow persistence

Harmony with PHP itself…

Architecture of PHP

Modern web architecture

write text to talk about it

PHP is “Cheap”

“A project done in Java will cost 5 times as much, take twice as long, and be harder to maintain than a project done in a scripting language such as PHP or Perl.”

—Phillip Greenspun

graphcis money shorten quote

PHP is “Scalable”

“ That a Java servlet performs better than a PHP script, under optimal conditions [has] nothing to do with scalability. The point is can your application continue to deliver consistent performance as volume increases. PHP delegates all the ‘hard stuff’ to other systems.”

— Harry Fuecks

graphics notes? shortne quote

PHP is “Pragmatic”

“ PHP is not about purity in CS principles or architecture; it is about solving the ugly web problem with an admittedly ugly, but extremely functional and convenient solution. If you are looking for purity, you are in the wrong boat. Get out now before you get hit by a wet cat!”

— Rasmus Lerdorf

graphics shorten quote

2 Bellefield Towers

Design Hubris

map of pit maybe

…walking to Bellefield Towers

make video of wpaking towards?

Gothic Romanesque architecture

The current Bellefield Church (two blocks away)

Other city towers

Allegheny Courthouse Main Tower & Four Tower Types at Jail (and other towers)

Tower of Learning

Within spitting distance of Bellefield Towers

Carnegie Library

Most iconic moment in baseball history

redo builds break out slides quots

Why is Bellefield Towers so Ugly?

Design Hubris?

Frameworks (almost by definition)

Develop in the PHP community?

Take over an existing project?

Limitations of Site Operations? Hosting? or Virtual hosting?

Business needs trump programmer desire?

Dealt with a user request?

break out slides, graphics

…at Tagged add slideshow

…at Tagged

Cubes

Waterfall process

Oracle RAC

Java

PHP4

Zend Accelerator

break out slides

Rework

From the Founders of 37 Signals

Last Book: “Getting Real”

Rework

“ Not Just Bad , but dangerous ”

—John Vincent, Leon Restaurants

Solutions Consider Environment

3 Golden Gate Bridge

The Design Pattern

design build quote of goldne gate bridge

the other bridge quote from emperor norton

quotes of sf

Same problem, different pattern

Original design was hybrid cantilever-suspension. Replaced by purse suspension

Art Deco

Bridge Tower, Lighting, pedestrial walkway

quote of art deco movemebnt

International Orange

Rust colored like the environment it lives in … and safe.

Part of the whole

Design Patterns Defined

“Each pattern describes a problem which occurs over and over again in our environment, and then describes the core of the solution to that problem, in such a way that you can use this solution a million times over, without ever doing it the same way twice.”

shorten quote

Certainly iconic

Me in front of both icons

Never the same way twice

How do you know which one?

How do you know which way?

blend transition in stages

Funky Caching again

“search for the closest matching valid URL and redirect, and use attempted url text as a DB keyword lookup”

—Rasmus Lerdorf

cleanup text

Javascript and CSS compiling & caching put a graphic or some text

<?php

$watermark = '3129080702_c4e76f71d7_o.png' ;

$dead_url = ' http://example.com/dead_image.png' ;

// {{{ start_image($filename, &$data)

/**

* Creates a gd handle for a valid file

* @param $filename string the file to get

* @param $data array the imagesize

* @return resource GD handle

*/

function start_image ( $filename , & $data ) {

$data = @ getimagesize ( $filename );

if (empty( $data )) { return null ; }

$data [ 'ratio' ] = $data [ 0 ]/ $data [ 1 ];

switch( $data [ 2 ]) {

case IMG_GIF : return imagecreatefromgif ( $filename );

case 3 : //problem where IMG_PNG is not bound correctly for my install

case IMG_PNG : return imagecreatefrompng ( $filename );

case IMG_JPG : return imagecreatefromjpeg ( $filename );

case IMG_WBMP : return imagecreatefromwbmp ( $filename );

case IMG_XPM : return imagecreatefromxbm ( $filename );

}

return null ;

}

// }}}

$requestimg = $_SERVER [ 'REDIRECT_URL' ];

if (! $_SERVER [ 'QUERY_STRING' ]) {

// redirect user to invalid image

tag_http :: redirect ( $dead_url );

return '' ;

}

// grab image to temp {{{

$ch = curl_init ( $_SERVER [ 'QUERY_STRING' ]);

$tempfile = tempnam ( '/tmp' , 'prod_remote_' );

$fp = f_open ( $tempfile , 'w' ); //again delete the "_"

curl_setopt ( $ch , CURLOPT_FILE , $fp );

curl_setopt ( $ch , CURLOPT_HEADER , 0 );

curl_exec_ ( $ch ); //delete the final "_"

curl_close ( $ch );

fclose ( $fp );

// }}}

// configure image and dimensions {{{

$size_data = array();

$im = start_image ( $tempfile , $size_data );

if (! $im ) {

unlink ( $tempfile );

return;

}

// }}}

// get watermark information {{{

$wm_data = array();

$wm = start_image ( $watermark , $wm_data );

if (! $wm ) {

return;

}

// }}}

// add watermark {{{

if ( $size_data [ 'ratio' ]> $wm_data [ 'ratio' ]) {

// image is wider format than the watermark

$new_smaller_dim = $wm_data [ 0 ] * ( $size_data [ 1 ]/ $wm_data [ 1 ]);

$dst_x = ( $size_data [ 0 ] - $new_smaller_dim )/ 2 ;

$dst_y = 0 ;

$dst_w = $new_smaller_dim ;

$dst_h = $size_data [ 1 ];

} else {

// image is taller format than the watermark

$dst_x = 0 ;

$dst_y = ( $size_data [ 1 ] - $new_smaller_dim )/ 2 ;

$dst_w = $size_data [ 0 ];

$dst_h = $new_smaller_dim ;;

}

imagecopyresized ( $im , $wm , $dst_x , $dst_y , 0 , 0 , $dst_w , $dst_h , $wm_data [ 0 ], $wm_data [ 1 ]);

header ( sprintf ( '%s 200' , $_SERVER [ 'SERVER_PROTOCOL' ]));

header ( sprintf ( 'Content-type: %s' , $size_data [ 'mime' ]));

// }}}

switch ( $size_data [ 2 ]) {

case IMG_GIF : imagegif ( $im ); break;

case 3 :

case IMG_PNG : imagepng ( $im ); break;

case IMG_JPG : imagejpeg ( $im ); break;

case IMG_WBMP : imagewbmp ( $im ); break;

case IMG_XPM : imagexbm ( $im ); break;

}

imagedestroy ( $wm );

imagedestroy ( $im );

?>

expand callouts

<?php

/**

*/

}

return null ;

}

// }}}

return '' ;

}

curl_close ( $ch );

fclose ( $fp );

// }}}

if (! $im ) {

return;

}

// }}}

$wm_data = array();

if (! $wm ) {

return;

}

// }}}

$dst_y = 0 ;

} else {

$dst_x = 0 ;

}

// }}}

case 3 :

}

?>

<?php

/**

*/

}

return null ;

}

// }}}

return '' ;

}

curl_close ( $ch );

fclose ( $fp );

// }}}

if (! $im ) {

return;

}

// }}}

$wm_data = array();

if (! $wm ) {

return;

}

// }}}

$dst_y = 0 ;

} else {

$dst_x = 0 ;

}

// }}}

case 3 :

}

?>

<?php

/**

*/

}

return null ;

}

// }}}

return '' ;

}

curl_close ( $ch );

fclose ( $fp );

// }}}

if (! $im ) {

return;

}

// }}}

$wm_data = array();

if (! $wm ) {

return;

}

// }}}

$dst_y = 0 ;

} else {

$dst_x = 0 ;

}

// }}}

case 3 :

}

?>

<?php

/**

*/

}

return null ;

}

// }}}

return '' ;

}

curl_close ( $ch );

fclose ( $fp );

// }}}

if (! $im ) {

return;

}

// }}}

$wm_data = array();

if (! $wm ) {

return;

}

// }}}

$dst_y = 0 ;

} else {

$dst_x = 0 ;

}

// }}}

case 3 : case IMG_PNG : imagepng ( $im ); break;

}

?>

<?php

/**

*/

}

return null ;

}

// }}}

return '' ;

}

curl_close ( $ch );

fclose ( $fp );

// }}}

if (! $im ) {

return;

}

// }}}

$wm_data = array();

if (! $wm ) {

return;

}

// }}}

$dst_y = 0 ;

} else {

$dst_x = 0 ;

}

// }}}

}

?>

<?php

/**

*/

}

return null ;

}

// }}}

return '' ;

}

curl_close ( $ch );

fclose ( $fp );

// }}}

if (! $im ) {

return;

}

// }}}

$wm_data = array();

if (! $wm ) {

return;

}

// }}}

$dst_y = 0 ;

} else {

$dst_x = 0 ;

}

// }}}

}

?>

Beyond Funky Caching

San Francisco

Looking around you for inspiration

quotes of san francisco?

Thanks! [email_address] terrychay.com/blog terrychay.com/blog terrychay.com/blog resize

Story about rounded rectangles

PHP Without PHP—Confoo

by terry chay on Mar 18, 2010

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