Second PHP revision example - arrays

PHP Revision example from a Well House Consultants training course
More on PHP Revision [link]

This example is described in the following article(s):
• PHP revision ... by example. - [link]

Source code: two.php Module: H300

This is a second PHP Revision example - Arrays

<?php

/* Shows far too many different features in one short piece of code
for its own good but - never mind - it's illustrative! */

/* Arrays

- Collection variables in PHP are known as arrays, but are actually ordered maps.
- they can be treated as an array, list (vector), hash table
        (an implementation of a map), dictionary, stack, queue, etc.
- array values can be other arrays, so trees and multidimensional
        arrays are possible.
- Use squarebrackets for indexing into an array

*/

# $names is an array indexed by numbers

$names = array("Alice","Robin","Miranda","Dennis","Sophie","Walter",
        "Glenda","Henry","Pat","James","Cleo","George");
$share = 10000.0;
array_push($names,"John"); // Add an item on end
$names[1] = "Robert"; // Change an item

# $giftsize is an associate array

$giftsize = array();

$kc = 0;
foreach ($names as $newchild) {
        $kc += 1;
        $each = sprintf("%.2f",$share/$kc);
        print "Adding $newchild, each gets $each\n";
        $giftsize[$newchild] = $each;
        }
?>

Second report ...

<?php

# Variable retained between PHP blocks

# We can sort an associative array

krsort($giftsize);
foreach (array_keys($giftsize) as $nm) {
        print "When $nm was added, gift became $giftsize[$nm]\n";
        }

date_default_timezone_set("Europe/London");

?>

Copyright, Well House Consultants, <?php print(date("Y")); ?>

<?php /* Sample output

wizard:examples graham$ php two.php
This is a second PHP Revision example - Arrays

Adding Alice, each gets 10000.00
Adding Robert, each gets 5000.00
Adding Miranda, each gets 3333.33
Adding Dennis, each gets 2500.00
Adding Sophie, each gets 2000.00
Adding Walter, each gets 1666.67
Adding Glenda, each gets 1428.57
Adding Henry, each gets 1250.00
Adding Pat, each gets 1111.11
Adding James, each gets 1000.00
Adding Cleo, each gets 909.09
Adding George, each gets 833.33
Adding John, each gets 769.23

Second report ...

When Walter was added, gift became 1666.67
When Sophie was added, gift became 2000.00
When Robert was added, gift became 5000.00
When Pat was added, gift became 1111.11
When Miranda was added, gift became 3333.33
When John was added, gift became 769.23
When James was added, gift became 1000.00
When Henry was added, gift became 1250.00
When Glenda was added, gift became 1428.57
When George was added, gift became 833.33
When Dennis was added, gift became 2500.00
When Cleo was added, gift became 909.09
When Alice was added, gift became 10000.00

Copyright, Well House Consultants, 2012
wizard:examples graham$

*/ ?>

Learn about this subject

This module and example are covered on the following public courses:
* PHP Techniques
* Intermediate PHP - weekend course / hobby / club / leisure users
Also available on on site courses for larger groups

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