spechal.com » PHP

Installing php-ffmpeg on CentOS 5.x

Spechal — Mon, 25 Jul 2011 16:24:58 +0000

This can be a pain due to a bug in the ffpmeg_frame.c file … here are the commands to get up and going

yum -y install ffmpeg ffmpeg-devel
wget http://sourceforge.net/projects/ffmpeg-php/files/ffmpeg-php/0.6.0/ffmpeg-php-0.6.0.tbz2/download
tar jxvf ffmpeg-php-0.6.0.tbz2
sed -i 's/PIX_FMT_RGBA32/PIX_FMT_RGBA/g' ffmpeg-php-0.6.0/ffmpeg_frame.c
cd ffmpeg-php-0.6.0 && phpize
./configure && make && make install
echo 'extension=ffmpeg.so' > /etc/php.d/ffmpeg.ini && /etc/init.d/httpd restart
php -v && php -m | grep ffmpeg

In this process you:
use yum to install ffmpeg and the ffmpeg development files
download php-ffmepg from sourceforge and extract it
apply the bug fix to the ffmpeg_frace.c file
change directories to the php-ffmpeg directory and phpize the module
configure, make and install the shared object (extension)
add the extension to the loaded php extensions
restart apache and verify no errors are shown on php startup and that ffmepg is loaded

If all is well, you should see your version of PHP with the copyrights on 3 lines and the last line showing ffmpeg

jQuery wdCalendar Plugin: Expected ajax return

Spechal — Wed, 09 Mar 2011 00:56:42 +0000

This plugin isn’t documented very well, so I figured I would post the bits and pieces I had issues with and hopefully help someone out.

First thing I needed to do was move all the functions into a class and refactor them, but first I wanted the data to still load in the calendar.

The data expected to be returned from the page listing the events is not defined on the wdCalendar project page, so here it is … in PHP.



$ret = array('events' => NULL);
$ret['events'][] = array('123456', // cal id
			  'Title', // event title
			  date('m/d/Y H:i', 
                                 strtotime('March 8 2011 12:00:00')), //start
			  date('m/d/Y H:i', 
                                 strtotime('March 8 2011 16:00:00')), // end
			  0, // all day event
			  0, // more than one day
			  0, // recurring
			  0, // color
			  1, // draggable
			  1, // editabble
			  'Address', // address
			  0 // mark as attending
			);
echo json_encode($ret);

phpize not found

Spechal — Sun, 06 Dec 2009 02:12:57 +0000

This error is typically generated when you don’t have the PHP development libraries installed.

Installing the libraries via repository is the easiest and quickest fix.

For Fedora/Red Hat:
yum install php5-dev

For Ubuntu/Debian:
apt-get install php5-dev

Python MySQL Associative Array

Spechal — Fri, 27 Nov 2009 23:26:04 +0000

By default, the MySQLdb module to access a MySQL database returns the data as an integer indexed array. Sometimes this is not desirable and an associative array is preferred, such as the mysql_fetch_assoc function in PHP. In addition, we will be using the pprint module which is similar PHP’s print_r

Here is the Python equivalent:

import MySQLdb
import pprint
# connect to the database here
db = MySQLdb.connect(...)
c = db.cursor(cursorclass=MySQLdb.cursors.DictCursor)
query = "SELECT `name`, `address` FROM `table`"
c.execute(query)
rows = c.fetchall()
c.close()
pprint.pprint(rows) # i.e. print_r($rows)

Hope that helps someone.

PHP function to validate MySQL UUID or GUID

Spechal — Sun, 15 Nov 2009 23:59:51 +0000

/**
   *  Function to validate a generated GUID / UUID
   *  @param string $guid GUID
   *  @return bool
   */
  function validGUID($guid){
    return preg_match('#^[a-z0-9]{8}-[a-z0-9]{4}-[a-z0-9]{4}-[a-z0-9]{4}-[a-z0-9]{12}$#', $guid);
  }

PHP function to emulate MySQL UUID

Spechal — Sun, 15 Nov 2009 23:58:15 +0000

/**
   *  uuid
   *
   *  uuid() simply replicates MySQL's UUID function, which returns a 36
   *  character "random" hash (32 alphanumeric, 4 dashes).
   *  @return string
   */
  function uuid(){
    return sprintf('%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
      mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff),
      mt_rand(0, 0x0fff) | 0x4000,
      mt_rand(0, 0x3fff) | 0x8000,
      mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff));
  }

PHP function to emulate Excel NormSInv

Spechal — Sun, 15 Nov 2009 15:58:56 +0000

 1){
      throw new Exception("NormSInv: Argument out of range.");
   } else if($p < $p_low){
      $q = pow(-2 * log($p), 2);
      $NormSInv = ((((($c1 * $q + $c2) * $q + $c3) * $q + $c4) * $q + $c5) * $q + $c6) /
         (((($d1 * $q + $d2) * $q + $d3) * $q + $d4) * $q + 1);
    } else if($p <= $p_high){
      $q = $p - 0.5; $r = $q * $q;
      $NormSInv = ((((($a1 * $r + $a2) * $r + $a3) * $r + $a4) * $r + $a5) * $r + $a6) * $q /
         ((((($b1 * $r + $b2) * $r + $b3) * $r + $b4) * $r + $b5) * $r + 1);
    } else {
      $q = pow(-2 * log(1 - $p), 2);
      $NormSInv = -((((($c1 * $q + $c2) * $q + $c3) * $q + $c4) * $q + $c5) * $q + $c6) /
         (((($d1 * $q + $d2) * $q + $d3) * $q + $d4) * $q + 1);
    }
    return $NormSInv;
}