April 28, 2008 at 11:50 am · Filed under Programming
There’s got to be an easier way to do this.
Perhaps I am unsophisticated. But sometimes when I am debugging I just want to print strings to see what is going on. When working with PHP’s DOM XML stuff, this is difficult. var_dump and print_r don’t do what I’d like. What I really want is just to see the XML of the DOMDocument or the DOMElement or the node list or whatever it is I happen to have in my variable (I may not even know).
There may be a much easier way to get a string representation of an arbitrary XML object in PHP. If so, please link it up in the comments. Failing that, here’s a rough pass at the kind of function I need:
function printXml($xml) {
$s = self::xmlToString($xml);
print "<pre>" . htmlentities($s) . "</pre>";
}
function xmlToString($xml) {
if ($xml instanceof DOMDocument) {
$s = $xml->saveXml();
} else if ($xml->length) {
$s = '';
foreach ($xml as $element) {
$s .= self::xmlToString($element);
}
} else {
$s = self::xmlToStringProper($xml);
}
return $s;
}
function xmlToStringProper($node) {
$dom = new DOMDocument();
$xmlContent = $dom->importNode($node, true);
$dom->appendChild($xmlContent);
return $dom->saveXml();
}
April 15, 2008 at 8:08 pm · Filed under Other
# Laptop
20:57:02 bakert@fenchurch:~$ history | awk '{a[$2] }END{for(i in a){print a[i] " " i}}' | sort -rn | head
3609 vi
2504 cd
2281 ruby
2096 u
1286 ls
1186 svn
808 td
779 mysql
634 gd
525 php5
# Home webserver
21:00:35 bakert@zaphod:~$ history | awk '{a[$2] }END{for(i in a){print a[i] " " i}}' | sort -rn | head
285 ls
220 vi
170 cd
122 sudo
34 cat
24 ssh
24 mi
23 df
22 ./reboot.sh
21 tail
# Remote webserver
bakert@fiero:~$ history | awk '{a[$2] }END{for(i in a){print a[i] " " i}}' | sort -rn | head
478 ls
315 cd
297 vi
248 mysql
95 mi
75 php
64 tail
62 crontab
49 date
44 cat
u is a script that uploads recent changes to the dev server at work
td is a script that adds an item to my todo list
gd is a script to open a local html file in a browser
mi is an alias for mv -i
I tag Brian and Aaron and David because I’d really like to see theirs. And I know they will have no problem ignoring me if they don’t want to do it.
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April 10, 2008 at 9:41 pm · Filed under Programming
I wrote my first programs at the age of 8. They are preserved on Tom 1, a 15 minute cassette tape. It starts with copied listings from the ZX Spectrum Introduction book. But before long there is a program called “askage” which I’m pretty sure is an original composition. Here’s the code in it’s entirety:
10 PRINT "How old are you?"
20 INPUT A$
30 PRINT "Really? You look much older than that!"
April 4, 2008 at 1:38 am · Filed under Programming
Nothing annoys me more than having to manually add tests to a central location in order to get them to run. Here’s some code that automatically and recursively (down the directory tree) finds files ending in Test.php and loads the tests within. Now all you need to do is create the tests.
< ?php
require_once 'PHPUnit/Framework.php';
require_once 'PHPUnit/TextUI/TestRunner.php';
define(Test, '/path/to/test/dir');
class AllTests {
public static function main() {
PHPUnit_TextUI_TestRunner::run(self::suite());
}
public static function suite() {
$suite = new PHPUnit_Framework_TestSuite('My Test Suite');
foreach (self::find_all_tests(TEST) as $path) {
require_once($path);
$class = preg_replace('%.*/(.*).php%', '$1', $path);
$suite->addTestSuite($class);
}
return $suite;
}
private static function find_all_tests($start_dir) {
$res = array();
foreach (glob(”$start_dir/*Test.php”) as $path) {
$res[] = $path;
}
foreach (glob($start_dir . ‘/*’, GLOB_ONLYDIR) as $subdir) {
$res = array_merge($res, self::find_all_tests($subdir));
}
return $res;
}
}
?>
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March 2, 2008 at 1:11 pm · Filed under Games
Fairly obvious one, this. UK Deal or No Deal contestant’s names flash up at the beginning of the show as if one is being selected at random. However, we can see very easily that this is not really happening.
If selection was random (one of 22 potential contestants randomly selected at the start of the show) 9.3% of contestants would have to wait 50 ore more shows for their turn. 1 in 100 contestants would have to wait 97 shows or more. In practice, this doesn’t happen. There have currently been more than 500 contestants and only one contestant (Lucy Harrington) has had to wait as long as 50 shows (she waited exactly 50). Filming 3 shows per day (15 per week), it would not be practical for contestants to ever wait much longer than 30 shows.
Spoiling my not-very-amazing detective work, Producer Glenn Hugill is on record as saying:
“No it’s not random. For some reason the Radio Times said it was, but that didn’t come from us. It’s always been a selection otherwise we can’t guarantee people that they will play within a reasonable time period/have people in the audience etc. The players for each week are selected on Monday and confirmed in threes each weekday morning.”
But I didn’t read that until after I’d written a little ruby program to tell me how long I might have to wait under random conditions!
Here’s a table of wait times in a truly random scenario:
Will sit out 0 shows ... 4.5 percent chance (cumulative: 4.5)
Will sit out 1 show ... 4.3 percent chance (cumulative: 8.9)
Will sit out 2 shows ... 4.1 percent chance (cumulative: 13.0)
Will sit out 3 shows ... 4.0 percent chance (cumulative: 17.0)
Will sit out 4 shows ... 3.8 percent chance (cumulative: 20.8)
Will sit out 5 shows ... 3.6 percent chance (cumulative: 24.4)
Will sit out 6 shows ... 3.4 percent chance (cumulative: 27.8)
Will sit out 7 shows ... 3.3 percent chance (cumulative: 31.1)
Will sit out 8 shows ... 3.1 percent chance (cumulative: 34.2)
Will sit out 9 shows ... 3.0 percent chance (cumulative: 37.2)
Will sit out 10 shows ... 2.9 percent chance (cumulative: 40.1)
Will sit out 11 shows ... 2.7 percent chance (cumulative: 42.8)
Will sit out 12 shows ... 2.6 percent chance (cumulative: 45.4)
Will sit out 13 shows ... 2.5 percent chance (cumulative: 47.9)
Will sit out 14 shows ... 2.4 percent chance (cumulative: 50.2)
Will sit out 15 shows ... 2.3 percent chance (cumulative: 52.5)
Will sit out 16 shows ... 2.2 percent chance (cumulative: 54.7)
Will sit out 17 shows ... 2.1 percent chance (cumulative: 56.7)
Will sit out 18 shows ... 2.0 percent chance (cumulative: 58.7)
Will sit out 19 shows ... 1.9 percent chance (cumulative: 60.6)
Will sit out 20 shows ... 1.8 percent chance (cumulative: 62.4)
Will sit out 21 shows ... 1.7 percent chance (cumulative: 64.1)
Will sit out 22 shows ... 1.6 percent chance (cumulative: 65.7)
Will sit out 23 shows ... 1.6 percent chance (cumulative: 67.3)
Will sit out 24 shows ... 1.5 percent chance (cumulative: 68.7)
Will sit out 25 shows ... 1.4 percent chance (cumulative: 70.2)
Will sit out 26 shows ... 1.4 percent chance (cumulative: 71.5)
Will sit out 27 shows ... 1.3 percent chance (cumulative: 72.8)
Will sit out 28 shows ... 1.2 percent chance (cumulative: 74.1)
Will sit out 29 shows ... 1.2 percent chance (cumulative: 75.2)
Will sit out 30 shows ... 1.1 percent chance (cumulative: 76.4)
Will sit out 31 shows ... 1.1 percent chance (cumulative: 77.4)
Will sit out 32 shows ... 1.0 percent chance (cumulative: 78.5)
Will sit out 33 shows ... 1.0 percent chance (cumulative: 79.4)
Will sit out 34 shows ... 0.9 percent chance (cumulative: 80.4)
Will sit out 35 shows ... 0.9 percent chance (cumulative: 81.3)
Will sit out 36 shows ... 0.9 percent chance (cumulative: 82.1)
Will sit out 37 shows ... 0.8 percent chance (cumulative: 82.9)
Will sit out 38 shows ... 0.8 percent chance (cumulative: 83.7)
Will sit out 39 shows ... 0.7 percent chance (cumulative: 84.4)
Will sit out 40 shows ... 0.7 percent chance (cumulative: 85.2)
Will sit out 41 shows ... 0.7 percent chance (cumulative: 85.8)
Will sit out 42 shows ... 0.6 percent chance (cumulative: 86.5)
Will sit out 43 shows ... 0.6 percent chance (cumulative: 87.1)
Will sit out 44 shows ... 0.6 percent chance (cumulative: 87.7)
Will sit out 45 shows ... 0.6 percent chance (cumulative: 88.2)
Will sit out 46 shows ... 0.5 percent chance (cumulative: 88.8)
Will sit out 47 shows ... 0.5 percent chance (cumulative: 89.3)
Will sit out 48 shows ... 0.5 percent chance (cumulative: 89.8)
Will sit out 49 shows ... 0.5 percent chance (cumulative: 90.2)
Will sit out 50 shows ... 0.4 percent chance (cumulative: 90.7)
Will sit out 51 shows ... 0.4 percent chance (cumulative: 91.1)
Will sit out 52 shows ... 0.4 percent chance (cumulative: 91.5)
Will sit out 53 shows ... 0.4 percent chance (cumulative: 91.9)
Will sit out 54 shows ... 0.4 percent chance (cumulative: 92.3)
Will sit out 55 shows ... 0.4 percent chance (cumulative: 92.6)
Will sit out 56 shows ... 0.3 percent chance (cumulative: 92.9)
Will sit out 57 shows ... 0.3 percent chance (cumulative: 93.3)
Will sit out 58 shows ... 0.3 percent chance (cumulative: 93.6)
Will sit out 59 shows ... 0.3 percent chance (cumulative: 93.9)
Will sit out 60 shows ... 0.3 percent chance (cumulative: 94.1)
Will sit out 61 shows ... 0.3 percent chance (cumulative: 94.4)
Will sit out 62 shows ... 0.3 percent chance (cumulative: 94.7)
Will sit out 63 shows ... 0.2 percent chance (cumulative: 94.9)
Will sit out 64 shows ... 0.2 percent chance (cumulative: 95.1)
Will sit out 65 shows ... 0.2 percent chance (cumulative: 95.4)
Will sit out 66 shows ... 0.2 percent chance (cumulative: 95.6)
Will sit out 67 shows ... 0.2 percent chance (cumulative: 95.8)
Will sit out 68 shows ... 0.2 percent chance (cumulative: 96.0)
Will sit out 69 shows ... 0.2 percent chance (cumulative: 96.1)
Will sit out 70 shows ... 0.2 percent chance (cumulative: 96.3)
Will sit out 71 shows ... 0.2 percent chance (cumulative: 96.5)
Will sit out 72 shows ... 0.2 percent chance (cumulative: 96.6)
Will sit out 73 shows ... 0.2 percent chance (cumulative: 96.8)
Will sit out 74 shows ... 0.1 percent chance (cumulative: 96.9)
Will sit out 75 shows ... 0.1 percent chance (cumulative: 97.1)
Will sit out 76 shows ... 0.1 percent chance (cumulative: 97.2)
Will sit out 77 shows ... 0.1 percent chance (cumulative: 97.3)
Will sit out 78 shows ... 0.1 percent chance (cumulative: 97.5)
Will sit out 79 shows ... 0.1 percent chance (cumulative: 97.6)
Will sit out 80 shows ... 0.1 percent chance (cumulative: 97.7)
Will sit out 81 shows ... 0.1 percent chance (cumulative: 97.8)
Will sit out 82 shows ... 0.1 percent chance (cumulative: 97.9)
Will sit out 83 shows ... 0.1 percent chance (cumulative: 98.0)
Will sit out 84 shows ... 0.1 percent chance (cumulative: 98.1)
Will sit out 85 shows ... 0.1 percent chance (cumulative: 98.2)
Will sit out 86 shows ... 0.1 percent chance (cumulative: 98.3)
Will sit out 87 shows ... 0.1 percent chance (cumulative: 98.3)
Will sit out 88 shows ... 0.1 percent chance (cumulative: 98.4)
Will sit out 89 shows ... 0.1 percent chance (cumulative: 98.5)
Will sit out 90 shows ... 0.1 percent chance (cumulative: 98.5)
Will sit out 91 shows ... 0.1 percent chance (cumulative: 98.6)
Will sit out 92 shows ... 0.1 percent chance (cumulative: 98.7)
Will sit out 93 shows ... 0.1 percent chance (cumulative: 98.7)
Will sit out 94 shows ... 0.1 percent chance (cumulative: 98.8)
Will sit out 95 shows ... 0.1 percent chance (cumulative: 98.9)
Will sit out 96 shows ... 0.1 percent chance (cumulative: 98.9)
Will sit out 97 shows ... 0.0 percent chance (cumulative: 99.0)
Will sit out 98 shows ... 0.0 percent chance (cumulative: 99.0)
Will sit out 99 shows ... 0.0 percent chance (cumulative: 99.0)
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January 21, 2008 at 1:08 am · Filed under Programming
So basically, there are 4 dimensions:
- Static (expressions have types) vs. dynamic (values have types)
- Strong (values cannot be coerced to other types without a cast) vs. weak (the runtime performs a variety of coercions for convenience)
- Latent (no type declarations) vs. manifest (type declarations)
- Nominal (subtyping relations are declared explicitly) vs. structural (subtyping relations are inferred from the operations available on types)
And you can place most languages on one of these 4 axes, though several support multiple forms of typing:
- Ocaml: static, strong, latent, structural typing
- Haskell: static, strong, latent, structural typing, with nominal typing available via newtype and manifest typing through optional type declarations.
- Erlang: dynamic, strong, latent, structural typing
- Scheme: dynamic, strong, latent, structural typing, with nominal typing available in many object systems.
- Common Lisp: dynamic, strong, latent or manifest typing. Same note about structural vs. nominal typing as Scheme, but nominal subtyping is used more often in practice.
- Python & Ruby: dynamic, strong, latent, structural typing. Nominal subtyping is available via isinstance or Ruby equivalent, but good practice frowns upon it.
- PHP: dynamic, weak, latent, nominal or structural typing. Culture is much friendlier to nominal subtyping than Python or Ruby, but it’s not required.
- Java & C : mostly static, strong, manifest, nominal typing. The casts give you a form of weak-typing when necessary, and C templates are structurally typed.
- C: static, generally weak, manifest, nominal typing.
- Assembly: dynamic, weak, latent, structural typing.
Reddit comment by Nostrademons
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January 18, 2008 at 1:20 pm · Filed under Programming
Some of us have spent years scraping news sites. Others have spent them downloading government data. Others have spent them grabbing catalog records for books. And each time, in each community, we reinvent the same things over and over again: scripts for doing crawls and notifying us when things are wrong, parsers for converting the data to RDF and XML, visualizers for plotting it on graphs and charts.
It’s time to start sharing our knowledge and our tools. But more than that, it’s time for us to start building a bigger picture together. To write robust crawl harnesses that deal gracefully with errors and notify us when a regexp breaks. To start converting things into common formats and making links between data sets. To build visualizers that will plot numbers on graphs or points on maps, no matter what the source of the input.
We’ve all been helping to build a Web of data for years now. It’s time we acknowledge that and start doing it together.
Oh yes. theinfo.org.
January 6, 2008 at 2:32 pm · Filed under Programming
The table with the foreign key in it belongs_to the table that that foreign key references.
The table with the referenced primary key in it has_one or has_many of the table with the foreign key in it.
I will not forget this again!
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December 16, 2007 at 9:11 am · Filed under Programming
If you need to use an explicit primary key and not an AUTO_INCREMENT with ActiveRecord I wrote this snippet that has proved very handy:
module ExplicitPrimaryKey
attr_accessor :pk
def before_create; self.id = pk; end
end
Then when you call the create method supply :pk => value along with the other values.
ActiveRecord is an ORM solution that grew out of Ruby on Rails. It is entirely separate and can be used outside of Rails.
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