Tag Archives: PHP

jQuery serializeObject 0.1

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I found myself in a situation recently where I wanted to have access to variables that would have been posted, in a the same structure as if the form had been posted and returned the JSON, using this jQuery plugin and Douglas Crockford’s JSON library, I think I’ve done it!

You can download the script here and there’s a demo here.

XML Entities in PHP

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Because htmlentities() doesn’t even come close.

This small file contains 4 functions (2 of which are taken from the PHP manual, credit given!) which will allow you to encode and decode entities from ASCII/unicode strings in either decimal or hexadecimal format for use in valid XML documents.

The xml_entity_decode() function accepts an optional second parameter to allow non-standard XML entities (that may have been specified in your schema) in the format:

array(
  // 'entity' => 'char'
  'amp' => '&',
  'lt' => '<',
  'gt' => '>',
  'apos' => '\'',
  'quot' => '"'
)

Example usage:

include('funcs.xmlentities.php');
 
$s = '<strong>This</strong> should be safe, but don\'t assume!<br/>';
print '<Field>'.xmlentities($s).'</Field>';
// outputs: <Field>&lt;strong&gt;This&lt;/strong&gt; should be safe, but don&apos;t assume!&lt;br/&gt;</Field>

You can get the script here, or there’s a demo here too.

PHP CSV Reader

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I’ve never really built a definitive CSV reader and end up building a quick implementation of one any time I need one.

But after working on the chunk script I decided that next time I build a CSV class I’d do it properly.

This is the result:

  <?php
  require('class.csv.php');
 
  header('Content-type: text/plain');
 
  $csv = new CSV('test.csv');
 
  while ($row = $csv->read()) {
    print_r($row);
  }

There’s an information page here, and the script is here.

CakePHP: Select Box Pagination

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Using CakePHP’s built in pagination system has saved me so much time in my current day job, but the latest designs I’m working on have drop-down box style pagination, as it’s possible to get many pages of results.

To change the named parameters in the current URL I’ve created this small javascript function that will amend the URL: Continue reading →

CakePHP: Components, redirect fail (On my part…)

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I’ve been working on a CakePHP project lately and created a small component which was only needed in one of my controllers:

class CounterComponent extends Component {
  var $components = array(
    'Session'
  );
 
  function i() {
    if ($this->Session->check('Counter.i')) {
      $i = ($this->Session->read('Counter.i') + 1);
 
    } else {
      $i = 0;
    }
 
    $this->Session->write('Counter.i', $i);
 
    return $i;
  }
 
  function clear() {
    $this->Session->delete('Counter.i');
  }
}

Continue reading →

PHP: Object Oriented Image Manipulation

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I’ve been working on a CMS lately and having to create thumbnails for uploaded images is always a pain, lots of maths working out the correct sizes and such, so I’ve created a fairly small script to manipulate images in an object-oriented style.

For example:

scale(400, 300);
$image-&gt;write('small-image.jpg');
 
$image2 = new Image('image2.jpg');
$image2-&gt;watermark = 'sample.png';
$image2-&gt;output();

I’ve only implemented a few of the GD library methods, but I think these are the most useful methods. I might have to work on something that rounds the corners too, but I don’t have any need for it just yet.

There’s a demo page as ever, and you can get the script here (It’s a bit big, because the sample image is included, here’s one without it).

String Variable Concatenation

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I stumbled across something odd today in PHP:

$r = '';
$r .= $r .= $r .= 'a';

Now, personally, I’d have expected a syntax error from the above code, but the result was even more confusing at first…

print $r; // 'aaaa'

Not sure if this was the expected output or not I tested similar code in other languages:

Ruby:

r = ''
r += r += r += 'a'
puts r # 'a'

Python:

r = ''
r += r += r += 'a'
#   File "", line 1
#     r += r += r += 'a'
#             ^
# SyntaxError: invalid syntax

Javascript:

var r = '';
r += r += r += 'a';
alert(r); // 'a'

Perl:

my $r = '';
$r .= $r .= $r .= 'a';
print $r; // 'aaaa'

That explains it!

So the reason the string is ‘aaaa’ seems to be that the code is evaluated from right to left:

$r = '';
$r += $r += $r += 'a';
 
// How it works:
//
// $r += 'a'; // 'a'
// $r += $r += 'a'; // 'a' + 'a';
// $r += $r += $r += 'a'; // 'aa' + ('a' + 'a')

I don’t think it’s a bug, well, at least I assume not, but is there a name for this?

Update: I asked some clever people for help understanding it.

JSS 0.2 – Nested CSS update

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So I thought I’d update the JSS script I wrote previously with a few changes I’ve been thinking about for a while.

The primary reason for the update is to add a new ‘non-CSS’ property of ‘include’. This property allows you to include styles that have already been defined in the current class. Continue reading →

Trackr 0.1 – jQuery based user interaction tracking (PHP/MySQL)

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Trackr is a very simple, lightweight (well, if you’re already using jQuery) user interaction tracker. It’s not particularly robust and is only in a fairly simple form right now.

The back end is written in PHP using MySQL for storage, but could easily be implemented in other languages.

To log data, you simply add a call to Trackr.init() to the page load event, passing the desired options as the only parameter to the function.

There are a variety of options that can be specified and for more information please see the test page.

You can get it here (includes jQuery 1.3.2).