Php arrays for RPG programmers

PHP Arrays for RPG Programmers

Function Junction
Mike Pavlak
Solutions Consultant
mike.p@zend.com
mike p@zend com
(815) 722 3454

© All rights reserved. Zend Technologies, Inc.

PHP Sessions
Sun 11:30 AM • What’s New with Zend Server

Sun 1:30 PM • Business Value of PHP

Sun 4:00 PM • Practical PHP by Example (Leth-Kjaer)

Mon 10:00 AM • PHP on IBM i: Getting Started

Mon 10:00 AM • DB Standards in Zend PHP usage (Sielhorst)

Tue 10:00 AM • MySQL on IBM i, Open Source & DB2 Store

Tue 11 30 A
11:30 AM • PHP Arrays for the RPG Programmer

| 2 Copyright © 2009 Zend Technologies, Inc, All rights
reserved
© All rights reserved. Zend Technologies, Inc. 02/03/
10

Agenda

• Introduce arrays in PHP
y
• Review RPG arrays
• Compare RPG and PHP array concepts
• More functions for arrays in PHP
• Q&A

| 3 © All rights reserved. Zend Technologies, Inc. 02/04/
10

Why are we talking about arrays?

• Fastest method for manipulating ordered sets
p g
• Highly leveraged in PHP development

• PHP developers take them for granted

• Available in RPG but long neglected

• Gap that needs to be closed

• Array defined:
…a data structure consisting of a group of
a
elements that are accessed by indexing

10

Introducing PHP Arrays


Data Type Review: 8 Data Types

• Scalar
• String “the quick brown fox...”, ‘123456’
• Integer 860, -9, 57009
• Floating point 19.99, 29.99, 3.1412
• Boolean true, false
• Compound
• Array [0] => 0 [1] => 1 [2] => 1 [3] => 2 [4] => 3…
• Object OOP
• Special
• Resource Handle
• Null Something that not nothing (empty set)
10

Three types of arrays (PHP 5.3 notation)

• Enumerated $arrayone = array(“Scooby”, “Shaggy”, “Daphne”,
“Fred”, “Velma”);
Fred Velma );
• Simple list

$arraytwo = array( ‘Cartoon1’=>’Scooby’,
‘Cartoon2’=>’Shaggy’,
‘C t 2’ ’Sh ’
• Associative ‘Cartoon3’=>’Daphne’,
‘Cartoon4’=>’Fred’,
• Custom key
‘Cartoon5’=>‘Velma’ );

$arraythree = array(
array(‘Scooby’, ‘Shaggy’, ‘Daphne’,
‘Fred’, ‘Velma’),
• Multidimensional array(‘Bugs’, ‘Daffy’, ‘Tweety’,
‘Elmer’, ‘Foghorn’) )
g ) );
• Array of arrays

10

Three types of arrays (PHP 5.4 notation)

• Enumerated $arrayone = [“Scooby”, “Shaggy”, “Daphne”,
“Fred”, “Velma”];
Fred Velma ];
• Simple list

$arraytwo = [ ‘Cartoon1’=>’Scooby’,
‘Cartoon2’=>’Shaggy’,
‘C t 2’ ’Sh ’
• Associative ‘Cartoon3’=>’Daphne’,
‘Cartoon4’=>’Fred’,
• Custom key
‘Cartoon5’=>‘Velma’ ];

$arraythree = array[
[‘Scooby’, ‘Shaggy’, ‘Daphne’,
‘Fred’, ‘Velma’],
• Multidimensional [‘Bugs’, ‘Daffy’, ‘Tweety’,
‘Elmer’, ‘Foghorn’] ];
g ] ]
• Array of arrays

10

Enumerated array

Code:

Output:
Array one: Array ( [0] => Scooby [1] => Shaggy [2] => Daphne [3] => Fred [4] => Velma )

10

Associative array

Code:

Output:

If you have trouble, think CL command parameters: Keyword & Values!!!

10

Multidimensional array

Code:

Output:
Array three: Array ( [0] => Array ( [0] => Scooby [1] => Shaggy [2] =>
Daphne [3] => Fred [4] => Velma ) [1] => Array ( [0] => Bugs [1] => Daffy
[2] => Tweety [3] => Elmer [4] => Foghorn ) )

10

Adding elements & growing the array
• PHP Arrays are dynamic
• C b sized on th fl no need t recompile
Can be i d the fly, d to il
• Example adding element:

10

Removing elements & reducing the array
• array_pop removes element from the end
• unset removes an element you specify ( entire array!)
t l t if (or ti !)

10

Trivia points
• Really only one type of array…associative
• D t content i non-restrictive, any d t t
Data t t is t i ti data types
• Each element can be different
• Array sizes change dynamically
• Supports no known limit of dimensions
 How much memory is on your machine?

 Humans like 2 or 3 (Think spreadsheet and workbook)

• Used heavily in i/o
• Both index and content can change!
• Index starts at zero while RPG starts at one

10

Got Doc? php.net/array
php net/array

10

Review RPG Arrays


In the beginning
beginning…
• Indicators were the only ordered set
• Original RPG and RPG II

Name Indicators Notes
Numbered *IN01-*IN99
IN01- IN99 Gen purpose
Command Key *INKA - *INKY No “O”
Halt H1-H9 Error recovery
Matching M1-M9, MR Matching records
Control L1-L9 Level Breaks
External U1 U8
U1-U8 Switches
Cycle 1P, LR, OA-OG, OV Printing

10

And then
then…
• RPG II - Then came simple arrays.
• Predefined length

• Single variable data type

• Built in E specs
E-specs

• Op Codes
• XFOOT – Summing aray

• MOVEA – Move data (Still most extremely powerful)

• LOKUP – Search the array

• SORTA – Gee, I wonder what this does?

• Seems like things paused here for a while

10

Today…
Today
• Compile time tables
• Great for static content
• Defined below “O” specs
• Two dimensional in nature

• RPG III – Multiple Occurrence Data Structure (MODS)
• Two dimensional feel
• Still a little clunky

• RPG IV – More Power!
• V5R1 – BIF’s : %LOOKUP, %LOOKUPGT, etc.
• V5R2 – DIM for Data Structures; MODS on Steroids!
• V5R3 – %SUBARR is an attempt at dynamic sizing
• V5R4 – XML processing
• i6.1 – DIM up to 16,773,104
• i7.1 – Sort subfields, Ascend-Descend, (still fixed size )
10

From the i7 1 manual
i7.1
• The first array entry for each record must begin in position 1.
• PHP starts with zero
• All elements must be the same length and follow each other with no
intervening spaces
• You must be kidding Still?
kidding…Still?
• If the number of elements in the array as specified on the definition
specification is greater than the number of entries provided, the remaining
elements are filled with the default values for the data type specified
specified.
• If you don't know the number of elements you will need in an array until
runtime, you can define the array with the maximum size, and then use a
subset of the array in your program
program.
• PHP is far more dynamic and this message leaves with work-files, still…

10

How PHP matches up
to RPG


Array shootout
• Base functions
• RPG has about a dozen op codes and BIF’s (Variations on BIF’s)
op-codes
• Many op-codes can manipulate array content

• PHP has 75 functions www php net/array
www.php.net/array

• Size
• RPG has limits 16 773 104 as if i7 1 (elements & bytes)
limits, 16,773,104 i7.1
• PHP has no practical limits, No “array index overflow” error

• RPG array must be defined, PHP grows dynamically (CT <= 100)
defined
• Type
• RPG uses static typing (one type, one length)
type
• PHP is dynamically typed (Each element can be different)
10

Simple Array Search (Lookup)

RPG

PHP I found her in position==> 2

10

Simple traverse

RPG

Scooby is the index value 0
Shaggy is the index value 1
PHP Daphne is the index value 2
Fred is the index value 3
Velma is the index value 4

10

RPG to PHP function map

Function
F ti RPG PHP Notes
N t
Search %LOOKUP array_search

Sum %XFOOT array sum
y_ Array prod can multiply
y_p py
Get portion %SUBARR array_slice Substring an array by chunks
Sort SORTA asort, arsort PHP sequence dynamic
Move
M MOVEA array_slice
li Substring by h
S b t i b character
t
Count %ELEM count Get number of elements

10

More functions in PHP


Interesting functions

• How to move around the array
y
• Randomize contents
• Array housekeeping
• Move array elements to variables
• Sort two or more arrays at once
• Execute a function on each element with no loop!
• Data file example

10

Navigate the array…Thanks Jon!
array Thanks

10

Mix it up with a shuffle

10

Consolidate,
Consolidate clean and sort arrays

10

Sort Multiple Arrays at once!

10

Manipulate all elements of an array

10

Get data from a file

• Loop through data
• List function copies to variables
p
• Implicit copy, be careful
• Arrays in PHP like Data
Structures in RPG: The
workhorse of data manipulation!

10

Debugging Arrays


Display the array formatted
formatted…
• <pre> presents text in fixed format font
• Lik courier-new for green b reports conversions
Like i f bar t i
• Used inside many HTML elements

10

Code for debug
debug…


New book, new printing, same great stuff!
book printing
Kevin Schroeder from Zend’s
Global Services Group
with
Jeff Ol
J ff Olen, co-author of…
th f

Get yours at MCPressonline
or at fine bookstores everywhere


Join us at ZendCon
The premier PHP conference!
October 22-25, 2012 – Santa Clara, CA

Conference Themes Conference Highlights
PHP in 2012 - The latest PHP technologies and tools • Sessions focused on how to best develop and deploy PHP
Learn how to leverage the latest mobile, HTML 5, testing and
PHP best practices • Sessions designed for all knowledge levels

Zend Framework 2 - Hit the ground running • Intensive tutorials for accelerated learning
Learn how to build faster, more modular and more expandable • PHP Certification crash courses and testing
applications
• Exhibit hall showcasing the latest products
Development & The Cloud – A love story
Learn how the latest developments in cloud-based services
services, • Special networking opportunities during meals and events
infrastructure and best practices can benefit you

www.zendcon.com

Php arrays for RPG programmers

Recommended

Recommended

More Related Content

More from COMMON Europe

More from COMMON Europe (20)

Recently uploaded

Recently uploaded (20)

Php arrays for RPG programmers