Wed, 13/04/2011 - 20:36 — horuskol

PHP function to generate a Version 4 GUID based on IETF RFC 4122: A Universally Unique IDentifier (UUID) URN Namespace

function generateGUID()
{
	$guid = '';
 
	$time_low = str_pad(dechex(mt_rand(0, 65535)), 4, '0', STR_PAD_LEFT) . str_pad(dechex(mt_rand(0, 65535)), 4, '0', STR_PAD_LEFT);
	$time_mid = str_pad(dechex(mt_rand(0, 65535)), 4, '0', STR_PAD_LEFT);
 
	$time_high_and_version = mt_rand(0, 255);
	$time_high_and_version = $time_high_and_version & hexdec('0f');

Mon, 14/12/2009 - 19:28 — horuskol

Okay, so automically generating a friendly URL for a blog post or forum post from their titles doesn't really take a lot - but this snippet might make it easier for you:

function make_slug($orig, $length = 0)
{
  $slug = preg_replace('/[^a-zA-Z0-9]/', '-', $orig);
  $slug = preg_replace('/\-\-+/', '-', $slug);
  $slug = strtolower($slug);
 
  if ($length > 0) {
    // limits the length of the slug
    $slug = substr($slug, 0, $length);
  }
 
  if (strrpos($slug, '-') == strlen($slug) - 1) {
    // removes any ending -
    $slug = substr($slug, -1);
  }

Tue, 06/10/2009 - 19:53 — horuskol

I recently helped a poster at HTML Forums who wanted to be able to reformat floating point numbers in PHP.

The problem is that some of these numbers were in exponential format. There was also a requirement not to round a number like 0.004 to 0, although the 'precision' was to be constant for all uses of this function in the script.

8.8458e-119    = 8.84e-119
1.06542e-52    = 1.07e-52
2.68e-36       = 2.68e-36
2.91405e-35    = 2.92e-35
0.0190644      = 0.01
0.0205511      = 0.02
0.004          = 0.004

Sun, 06/09/2009 - 14:13 — horuskol

A fun little function that will produce the Roman Numeral representation for any number from 1-3999.

The reason for the limitation is because the Romans used barred letters for the number 5000 and larger, and the representation of 4000 would be MV, which is hard to represent in a simple ASCII string (maybe as an exercise to the reader, the function can be extended?).

function intToRoman($number)
{
    if (!is_numeric($number)) {
        echo "Input is not a number\r\n\r\n";
        return;
    }
 

Sun, 26/07/2009 - 19:00 — horuskol

I recently helped another developer looking for a way to only allow access to one site from an iframe on another. Ideally, this would be done with the HTTP_REFERRER header, but this isn't always set by the browser, and so would prevent too many people from seeing the content properly.

My solution was simply to use a time-based key that could be generated on the site containing the iframe and tested on the remote server before allowing access to the content.

Tue, 25/11/2008 - 23:07 — horuskol

Following up on the astrpos() function, here is an astrstr() function:

Mon, 13/10/2008 - 22:39 — horuskol

Description

• int astrpos ( string $haystack, array $needles [, $offset [, int $flags ] ] )

  Returns the numeric position of either the first needle found in the haystack, or the first instance of a needle in the haystack.

Parameters

• haystack

  The string to search in

• needle

  An array of strings to search in the haystack for

• offset

Mon, 13/10/2008 - 22:39 — horuskol

<?php
 
include_once('astrpos.php'); // or however you want to include it
 
$needles = array(
 'apple',
  'banana',
 'pear',
 'orange'
);
 
$haystack = 'The fruiterer has some bananas and apples today. Unfortunately, there are no oranges, but the pears will be in tomorrow.';
 
// this will return the position of 'banana' - the first needle in the haystack
echo astrpos($haystack, $needles) . '<br>';
 
// this will return the position of 'apple' - the first needle in the array of needles
echo astrpos($haystack, $needles, 0, ASTR_NEEDLE_ORDER) . '<br>';
 

Mon, 13/10/2008 - 22:39 — horuskol

<?php
 
/**
 * function astrstr()
 *
 * Function to find the first instance of any needle from an array of strings 
 * within a string
 * 
 *
 * @author      Stuart Jones <stuart@random-tweak.co.uk>
 * @copyright   Copyright 2008 Stuart Jones
 * @version    08.11.25
 * @license   <a href="http://www.gnu.org/licenses/gpl.html<br />
" title="http://www.gnu.org/licenses/gpl.html<br />
">http://www.gnu.org/licenses/gpl.html<br />
</a> * 
 * @param    string          $haystack
 * @param    array&lt;string&gt;   $needles
 * @param   [int          $offset]
 * @param   [int          $flags]
 */
 
 
// define constants for function flags 
if (!defined('ASTR_NEEDLE_ORDER')) { define('ASTR_NEEDLE_ORDER', 1); }

Mon, 13/10/2008 - 22:39 — horuskol

Description

• int astrstr ( string $haystack, array $needles [, $offset [, int $flags ] ] )
  Returns the first instance of either the first needle found in the haystack, or the first instance of a needle in the haystack.

Parameters

• haystack

  The string to search in

• needle

  An array of strings to search in the haystack for

• offset