hubfactor

[PHP] innerHTML of a DOMElement

2009-01-19T00:56:07-08:00

The equivalent of the non-standard DOM property 'innerHTML'.

<?php
function innerHTML($node){
  $doc = new DOMDocument();
  foreach ($node->childNodes as $child)
    $doc->appendChild($doc->importNode($child, true));
    
  return $doc->saveHTML();
}

[PHP] Parse HTTP Accept headers

2009-01-07T16:25:13-08:00

a) define a list of MIME types and their corresponding local formats.
b) parse the HTTP Accept headers and pick the available format with the highest q value.

The explode parameter might not be enough - can there be spaces and other characters, not just ',' and ';q='?

<?php
function parse_accept_headers($default = 'html'){
  $formats = array(
    'text/html' => 'html',
    'application/xhtml+xml' => 0,
    'application/xml' => 0,
    '*/*' => 'html',
    );

  $accept = array();
  foreach (explode(',', $_SERVER['HTTP_ACCEPT']) as $header){
    $parts = explode(';q=', $header);
    if (count($parts) === 1)
      $parts[1] = 1;
    $accept[$parts[0]] = $parts[1];
  }

  arsort($accept);
  $accept[] = $default;

  foreach ($accept as $format => $q)
    if (array_key_exists($format, $formats) && $formats[$format])
      break;
  
  return array($format, $formats[$format]);
}

[PHP] Generate a numbered file name

2008-10-23T13:53:24-07:00

Create a file name from the given prefix and suffix, incorporating an incremented number to ensure that the file doesn't already exist.

<?php
function unique_file($prefix, $suffix){
  $file = sprintf('%s.%s', $prefix, $suffix);
  if (file_exists($file))
    do 
      $file = sprintf('%s.%d.%s', $prefix, ++$i, $suffix);
    while (file_exists($file));

  return $file;
}

[PHP] On Moving my xml parsing into a function.

2008-06-25T11:26:14-07:00

<?php
function page_xml($page){
  $xml = array(
    'home' => 'cyloop_mobile.xml',
    'artist' => 'cyloop_mobile.xml',
    'people' => 'cyloop_mobile.xml',
    'news' => 'cyloop_mobile.xml'
    );
    
  return simplexml_load_file('http://cm.cyloop.com/feeds/drupal/' . $xml[$page]);
}

$xml = page_xml('home');

foreach ($xml->xpath('item/title') as $artist)
  printf('<li>%s</li>', htmlspecialchars($artist));

[PHP] On Content Page Include

2008-04-11T21:30:12-07:00

<?php
$id = $_GET['id'] ? $_GET['id'] : 'news'; // default = 'news'
$file = "includes/$id.php";
if (strpos($id, '/') !== FALSE || !file_exists($file)) die('Naughty!'); // no directory traversal or missing files allowed
include $file;

[JavaScript] On Random URL

2008-04-11T21:13:36-07:00

Back to Javascript...

<script type="text/javascript" id="target">
var urls = [["url1", "name1"], ["url2", "name2"], ["url3", "name3"]];

var link = urls[Math.floor(Math.random() * urls.length)];

var a = document.createElement("a");
a.href = link[0];
a.textContent = link[1];

var li = document.createElement("li");
li.appendChild(a);

var target = document.getElementById("target");
target.parentNode.insertBefore(li, target);
</script>

[PHP] Download all audio enclosures from an RSS feed

2008-04-11T20:48:15-07:00

Given an RSS feed and an output directory, this should download all the audio files from the feed into that directory.

<?php
if (count($argv) != 3)
	die("Usage: $argv[0] <RSS feed URL> <output dir>\n");	

$rss = simplexml_load_file($argv[1]);
$rss->registerXPathNamespace('media', 'http://search.yahoo.com/mrss/');

$media = $rss->xpath("//item/media:content[@type='audio/mpeg']");
if (empty($media)){
	$media = $rss->xpath("//item/enclosure[@type='audio/mpeg']");
	if (empty($media))
		die("No media files found\n");
}

$curl = curl_multi_init();
$connections = array();
$files = array();

foreach ($media as $enclosure){
  $url = (string) $enclosure['url'];
  $md5 = md5($url);
  
  print "$url\n";
  
  $file = $argv[2] . "/$md5.mp3";
  if (file_exists($file)) continue;
  
  $files[$md5] = fopen($file, 'w');
  
  $connections[$md5] = curl_init();
  curl_setopt_array($connections[$md5], array(
    CURLOPT_URL => $url,
    CURLOPT_FOLLOWLOCATION => TRUE,
    CURLOPT_MAXREDIRS => 3,
    CURLOPT_FILE => $files[$md5],
  	));
  	
  curl_multi_add_handle($curl, $connections[$md5]);
}

print "Downloading...";

$running = NULL;
do {
   curl_multi_exec($curl, $running);
   sleep(1);
} while ($running > 0);

foreach ($connections as $md5 => $connection){
  if ($data = curl_multi_getcontent($connection))
    file_put_contents($files[$md5], $data);
    
  curl_multi_remove_handle($curl, $connection);
  fclose($files[$md5]);
}

curl_multi_close($curl);

print "finished.\n";

[PHP] Trim an image vertically

2008-03-30T20:25:27-07:00

Originally from http://zavaboy.com/2007/10/06/trim_an_image_using_php_and_gd

Could do with a way to detect the background colour automatically (from the bottom-left corner pixel of the image?).

<?php

function imagetrim(&$im){
  $bg = imagecolorallocate($im, 255, 255, 255); // white
    
  $width = imagesx($im);
  $height = imagesy($im);

  foreach (range($height - 1, 0) as $y)
    foreach (range($width - 1, 0) as $x)
      if (imagecolorat($im, $x, $y) != $bg)
        break 2;

  $im2 = imagecreatetruecolor($width, $y);
  $bg2 = imagecolorallocate($im2, 255, 255, 255); // white
  imagefill($im2, 0, 0, $bg2);
  imagecopy($im2, $im, 0, 0, 0, 0, $width, $y);

  $im = $im2;
}

[PHP] On Parse del.icio.us RSS feed

2008-03-05T17:58:49-08:00

SimpleXML isn't an RDF parser, so that wouldn't be better.

[JavaScript] On Zoom all image files from small to medium, medium to large etc..

2008-03-02T16:08:17-08:00

I hadn't realised that HTMLCollection arrays had properties other than the selected elements. I guess it's better to iterate the old way then:

javascript:
(function(){
  var imgs = document.getElementsByTagName("img");
  for (var i = 0; i < imgs.length; i++) {
    var img = imgs[i];
    if (img.className == "icon") continue;
    img.src = img.src.replace(/size=(small|medium)/, "size=large");
    img.style.width = "75px";
    img.style.height = "75px";
  }
}
)()

[JavaScript] On Zoom all image files from small to medium, medium to large etc..

2008-02-28T19:26:32-08:00

javascript:
(function(){
  var imgs = document.getElementsByTagName("img");
  for each (var img in imgs) {
    if (img.className == "icon") continue;
    img.src = img.src.replace(/size=medium/, "size=large");
    img.style.width = "75px";
    img.style.height = "75px";
  }
}
)()

[JavaScript] On Mathtex bookmarklet

2008-02-21T17:58:21-08:00

Ignoring the second version, which should be using document.createElement and document.appendChild

javascript:
(function(){
  var tex=prompt("TeX input:","");
  if(tex){
    var w=window.open("http://www.forkosh.dreamhost.com/mathtex.cgi?"+encodeURIComponent(tex),"latexbox","width=300,height=200");
    w.focus();
  }
}
)();

[PHP] On Removing Parameters from an URL

2008-02-08T11:52:54-08:00

<?php

$url = 'http://www.example.com/url.php?t=4&p=5&sid=ddf175fd02216cbe9fab9a4b528d7185&hilite=2c23tra#link';
$remove = array('sid','t');

$parsed = parse_url($url);
parse_str($parsed['query'], $params);

$parsed['params'] = array_diff_key($params, array_fill_keys($remove, 0));
print_r($parsed);

[JavaScript] On Beautify JS Date to how recently the event occured.

2008-02-07T18:22:32-08:00

Hope the date's not in the future...

Date.prototype.when = function(){
  var diff = (new Date() - this) / 1e3;
  var u = [ "second", "minute", "hour", "day", "week", "month", "year" ];
  var s = [ 1, 60, 60, 24, 7, 4.333, 12, 1e9 ]; // 1e9 = hack for speed

  for (var i in s)
    if ((diff /= s[i]) < 1)
      return ~~ (diff *= s[i]) + " " + u[i-1] + (diff > 1 ? "s" : "");
}

[JavaScript] Recursively dump an object

2008-02-01T12:40:24-08:00

Given an object, iterate through it and dump the properties.

function odump(object, depth, max){
  depth = depth || 0;
  max = max || 2;

  if (depth > max)
    return false;

  var indent = "";
  for (var i = 0; i < depth; i++)
    indent += "  ";

  var output = "";  
  for (var key in object){
    output += "\n" + indent + key + ": ";
    switch (typeof object[key]){
      case "object": output += odump(object[key], depth + 1, max); break;
      case "function": output += "function"; break;
      default: output += object[key]; break;        
    }
  }
  return output;
}

[PHP] Parse del.icio.us RSS feed

2008-01-28T16:08:27-08:00

Uses ARC RDF parser from http://arc.semsol.org/

<?php

require_once("arc/ARC2.php"); // http://arc.semsol.org/

$url = 'http://www.google.com/';  // URL to investigate

$ns_rss = 'http://purl.org/rss/1.0/';
$ns_dc = 'http://purl.org/dc/elements/1.1/';
$ns_rdf = 'http://www.w3.org/1999/02/22-rdf-syntax-ns#';

$md5_url = md5($url);
$rss_url = 'http://del.icio.us/rss/url/' . $md5_url;
$html_url = 'http://del.icio.us/url/' . $md5_url;

$rdf = file_get_contents($rss_url);

$parser = ARC2::getRDFXMLParser();
$parser->parse($rss_url, $rdf);
$root = $parser->getSimpleIndex();

$channel = $root["$html_url"];
$items_id = $channel[$ns_rss . 'items'][0];
$items = $root["$items_id"];

$output = array();
foreach ($items as $key => $triple){
  $item = $root["$triple[0]"]; // pick out the individual item by ID
  
  if ($item[$ns_rdf . 'type'][0] == $ns_rss . 'item'){ // if it's an "rss item"
    $output[] = array(
      'creator' => $item[$ns_dc . 'creator'][0],
      'tags' => $item[$ns_dc . 'subject'][0],
      'description' => $item[$ns_rss . 'description'][0],
      );
  }
}
print_r($output);