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Internet Technology - Building the web - ** FREE Code snippets and helpful tips. **
INDEX:

+ HTML Starter File
+ PHP
+ FREE SCRIPT: Generate Time Option List 
+ Tips and Tricks for PHP - Helpful Code Snippets
+ MySQL
+ Tips and Help for MySQL
+ Vote against software patents


HTML Starter File
This is a simple HTML help file for beginners. Simply download the index.txt file. Follow the instructions that are written into the code. Then change the ".txt" to ".html" in the file name.


PHP

PHP is a all-purpose scripting language that is suited for Web development and can be embedded into HTML.
Installation materials can be obtained from:
Berkeley DB2 (Unix/Win) : http://www.sleepycat.com/.
Get a US mirror - download PHP
http://us2.php.net/get/php-5.0.5.tar.bz2/from/a/mirror

+ Tips and Tricks for PHP:
Resources: Zend Technologies, PHP.org, Ironpaper Design, and anonymous entries

+ How to resize and center an image:
<?
function miniatura ( $imagem , $l , $a ){
$tam = getimagesize ( $imagem );
$x = (( $tam [ 0 ]/ 2 )-( $l / 2 ));
$y = (( $tam [ 1 ]/ 2 )-( $a / 2 ));
$img = imagecreatefromjpeg ( $imagem );
         if(( $l <= $tam [ 0 ])&&( $a <= $tam [ 1 ])){
$mini = imagecreate ( $l , $a );
imagecopyresized ( $mini , $img , 0 , 0 , $x , $y , $l , $a , $l , $a );
             return imagejpeg ( $mini );
imagedestroy ( $mini );
         }else{
             return imagejpeg ( $img );
         }
imagedestroy ( $img );
     }
header ( "Content-type: image/jpeg" );

// imagem - local imagem
// l - largura final (width)
// a - altura fianl (height)
echo miniatura ( $imagem , $l , $a );
?>
+ Appying a screen to an image:
<?php

function screen ( & $im ) {
$imx = imagesx ( $im );
$imy = imagesy ( $im );

$black = imagecolorallocate ( $im , 0 , 0 , 0 );

     for( $y = 1 ; $y <= $imy ; $y ++ ) {
         for( $x = 1 ; $x <= $imx ; $x ++ ) {
             if( ( $y % 2 ) && ( $x % 2 ) )
imagesetpixel ( $im , $x , $y , $black );
             else if( !( $x % 2 ) )
imagesetpixel ( $im , $x , $y , $black );
         }
     }
}

?>
+ Bank ID Validator - validates the supplied ABA number using a simple mod 10 check digit routine:
<?php

function abavalidate ( $aba )
{
// First, check for 9 digits and non-numeric characters.
if ( ereg ( "^[0-9]{9}$" , $aba ))
   {
$n = 0 ;
     for ( $i = 0 ; $i < 9 ; $i += 3 )
     {
$n += ( substr ( $aba , $i , 1 ) * 3 )
         + ( substr ( $aba , $i + 1 , 1 ) * 7 )
         + ( substr ( $aba , $i + 2 , 1 ));
     }

// If the resulting sum is an even multiple of ten (but not zero),
     // the aba routing number is good.

if ( $n != 0 && $n % 10 == 0 )
     {
       return( true ); // found good aba
}
     else
     {
       return( false );
     }

   }
   else
   {
     return( false );
   }
}

?>
+ USPS Shipping Calculator:
<?php
class USPS {
     var $server = "" ;
     var $user = "" ;
     var $pass = "" ;
     var $service = "" ;
     var $dest_zip ;
     var $orig_zip ;
     var $pounds ;
     var $ounces ;
     var $container = "None" ;
     var $size = "REGULAR" ;
     var $machinable ;

     function setServer ( $server ) {
$this -> server = $server ;
     }

     function setUserName ( $user ) {
$this -> user = $user ;
     }

     function setPass ( $pass ) {
$this -> pass = $pass ;
     }

     function setService ( $service ) {
/* Must be: Express, Priority, or Parcel */
$this -> service = $service ;
     }

     function setDestZip ( $sending_zip ) {
/* Must be 5 digit zip (No extension) */
$this -> dest_zip = $sending_zip ;
     }

     function setOrigZip ( $orig_zip ) {
$this -> orig_zip = $orig_zip ;
     }

     function setWeight ( $pounds , $ounces = 0 ) {
/* Must weight less than 70 lbs. */
$this -> pounds = $pounds ;
$this -> ounces = $ounces ;
     }

     function setContainer ( $cont ) {
/*
         Valid Containers
                 Package Name             Description
         Express Mail
                 None                For someone using their own package
                 0-1093 Express Mail         Box, 12.25 x 15.5 x
                 0-1094 Express Mail         Tube, 36 x 6
                 EP13A Express Mail         Cardboard Envelope, 12.5 x 9.5
                 EP13C Express Mail         Tyvek Envelope, 12.5 x 15.5
                 EP13F Express Mail         Flat Rate Envelope, 12.5 x 9.5

         Priority Mail
                 None                For someone using their own package
                 0-1095 Priority Mail        Box, 12.25 x 15.5 x 3
                 0-1096 Priority Mail         Video, 8.25 x 5.25 x 1.5
                 0-1097 Priority Mail         Box, 11.25 x 14 x 2.25
                 0-1098 Priority Mail         Tube, 6 x 38
                 EP14 Priority Mail         Tyvek Envelope, 12.5 x 15.5
                 EP14F Priority Mail         Flat Rate Envelope, 12.5 x 9.5

         Parcel Post
                 None                For someone using their own package
         */

$this -> container = $cont ;
     }

     function setSize ( $size ) {
/* Valid Sizes
         Package Size                Description        Service(s) Available
         Regular package length plus girth     (84 inches or less)    Parcel Post
                                         Priority Mail
                                         Express Mail

         Large package length plus girth        (more than 84 inches but    Parcel Post
                             not more than 108 inches)    Priority Mail
                                         Express Mail

         Oversize package length plus girth   (more than 108 but        Parcel Post
                              not more than 130 inches)

         */
$this -> size = $size ;
     }

     function setMachinable ( $mach ) {
/* Required for Parcel Post only, set to True or False */
$this -> machinable = $mach ;
     }

     function getPrice () {
// may need to urlencode xml portion
$str = $this -> server . "?API=Rate&XML=<RateRequest%20USERID="";
         $str .= $this->user . ""%20PASSWORD="" . $this->pass . ""><Package%20ID=" 0 "><Service>" ;
$str .= $this -> service . "</Service><ZipOrigination>" . $this -> orig_zip . "</ZipOrigination>" ;
$str .= "<ZipDestination>" . $this -> dest_zip . "</ZipDestination>" ;
$str .= "<Pounds>" . $this -> pounds . "</Pounds><Ounces>" . $this -> ounces . "</Ounces>" ;
$str .= "<Container>" . $this -> container . "</Container><Size>" . $this -> size . "</Size>" ;
$str .= "<Machinable>" . $this -> machinable . "</Machinable></Package></RateRequest>" ;

$fp = fopen ( $str , "r" );
         while(! feof ( $fp )){
$result = fgets ( $fp , 500 );
$body .= $result ;
         }
fclose ( $fp );

# note: using split for systems with non-perl regex (don't know how to do it in sys v regex)
if (! ereg ( "Error" , $body )) {
$split = split ( "<Postage>" , $body );
$body = split ( "</Postage>" , $split [ 1 ]);
$price = $body [ 0 ];
             return( $price );
         } else {
             return( false );
         }
     }

     function trackPackage ( $ids ) {
$url = "$this->server?API=Track&XML=" ;
$xml = "<TrackRequest USERID=" $this -> user " PASSWORD=" $this -> pass ">" ;

         for ( $i = 0 ; $i < count ( $ids ); $i ++) {
$id = $ids [ $i ];
$xml .= "<TrackID ID='$id'></TrackID>" ;
         }

$xml .= "</TrackRequest>" ;
$xml = urlencode ( $xml );
$url = $url . $xml ;

$fp = fopen ( $url , "r" );
         while (! feof ( $fp )) {
$str .= fread ( $fp , 80 );
         }
fclose ( $fp );

$cnt = 0 ;

$text = split ( "<TrackInfo ID=" , $str );
         for ( $i = 0 ; $i < count ( $text ); $i ++) {
             if ( ereg ( "<TrackSummary>(.+)</TrackSummary>" , $text [ $i ], $regs )) {
$values [ "eta" ] = $regs [ 1 ];
                 if ( eregi ( "delivered" , $values [ "eta" ])) {
$values [ "eta" ] = "Delivered" ;
                 } else {
$values [ "eta" ] = "In Transit" ;
                 }
$cnt ++;
             }
         }
$values [ "type" ] = "Priority Mail" ;

         return $values ;
     }
}
?>
Generate Time Option List - FOR - Select statement


+ MySQL
The World's Most Popular Database. Open source database.
http://dev.mysql.com/tech-resources/

News:
+ MySQL 5 is on its way! -- And .. to test this new candidate, prizes will be given for bug finders and blog writers!
Tips and Help:

+ SQL Injection
SQL injection is a common form of hacking a website or preying on a vulnerability of a website. This form of hacking attacks the database directly. SQL injection can happen if the website's functionality does not include adequate text validation code. SQL inject happens when unsuitable data is executed by the database--this allows the hacker to access the database and manipulate it.

 




+ Vote Against Software Patents
Basically patenting software would hurt development, because it allows only large corporations to deal with the ongoing issues of an ever changing world of discovery and innovation. In addition, it would slow down the rate of discovery and innovation to the terms of the patent, which is currently a 20 year span ( even a one year span would prove harmful to innovation of emerging technologies ). If you look at the case of MySQL and other open-source structures, innovation through an open scientific community has excelled far beyond the scope of privatized development, an example of which is Microsoft's MSSQL.
Express yourself -- Vote Now >>>>>>>