PHP for HTML Gurus - J and Beyond 2012

PHP for HTML Gurus
Andrea Tarr
Tarr Consulting
J and Beyond 2012

Outline
• PHP Basics
• Explanation of
actual code in
templates &

Beyond 2012 • Andrea Tarr
PHP for HTML Gurus • J and
layouts
• Changing code
and seeing it in
action
• Book give away
2

PHP Basics
• Get in and out of PHP with <?php ?>
• End each statement with a semi-colon
<?php
$first_name = 'Andrea';

$last_name = 'Tarr';
?>

• Whitespace is irrelevant
<?php $first_name='Andrea';$last_name='Tarr';?>

• Omit any final ?> at the end of a file 3

Comments
• Single line comments
// This is a single line comment
$language = 'PHP'; // End of line comment
// Multiple lines of single comments

// can be done by repeating the slashes

• Multiple line comments
/* With this type of comment you can
start a comment on one line and end
it on an other line */
4

Variables
• Used to store information that can change
• Start with a $
• Assign a value with =
• Use single ('') or double ("") quotes for text

• You need to assign a value before you can use the
variable
• Use echo to display a value
• Use a dot (.) to join items together

$first_name = 'Andrea';
$last_name = 'Tarr'; 5
echo $first_name . ' ' . $last_name;

$Variable Types
• String Text: Andrea
• Numbers: 42
• Logical: True/False, 1/0
• Array: An array is a list, either indexed or named

• [0]=>Sun, [1]=>Mon, [2]=>Tue, [3]=>Wed
• Name=>Joomla, Version=>2.5,
• You can nest arrays
• Object: We'll come back to Object shortly

6

Functions()
• Functions perform an action
• You recognize a function by the ()
• You can pass information to the function in the ()
$full_name = ' Andrea Tarr ';
echo trim($full_name);

• This results in Andrea Tarr

• You can pass a function to a function
echo strtoupper(trim($full_name);

• This results in ANDREA TARR 7

CONSTANTS
• Constants are assigned once and don't change
• No $
• Usually in ALL CAPS
define('SITENAME', 'My Site');

echo SITENAME;

8

Objects
• Think of an object as a named array plus functions
• Properties are variables
• Functions are also called methods

Examples:
• $item->title contains the title
• $item->introtext contains the intro text
• $params->get('show_modify_date')

9

Classes
• Classes are the blueprints that are used to create
objects
• You can use the classes directly without creating an
object

Examples:
• JText::_('COM_CONTENT_READ_MORE');
• JHtml::_('string.truncate', ($this->item->title),
$params->get('readmore_limit'))

10

Making Decisions: if/else
• Example 1
if ($sum > 10) :
// do something when greater than 10
else :
// do something when 10 or less

endif;

• Example 2
if ($errors) :
// do something when there are errors
endif;
11
• You can also nest if statements

Comparison Operators

Don't use = to compare!

12


One Line If Statement
• Normal way
if ($gender == 'M') :
echo 'Man';
else :

echo 'Woman';
endif;

• One line version
echo ($gender == 'M') ? 'Man' : 'Woman';

13

Alternative Syntax
• Alternative Syntax used when mixing with HTML
if ($sum > 10) :
else :
// do something when 10 or less

endif;

• Normal syntax with curly braces
if ($sum > 10) {
} else {
// do something when 10 or less 14
}

Looping
• While
• Repeats while a condition is true
• Do/While
• Does it at least once then repeats while true
• For

• Loops a given number of times
• Foreach
• Repeats the code for each element in an array or
object
• Jumping out early
• Continue
• Jump to the next iteration
• Break 15
• Jump out of the loop

Template index.php file
• Template Parameters
• Conditional Stylesheets
• Conditional Positions
• One Line If Statement

16

Template Parameters
$color = $this->params->get('templatecolor');

<link rel="stylesheet" href="<?php echo
$this->baseurl ?>/templates/<?php echo

$this->template; ?>/css/<?php echo
htmlspecialchars($color); ?>.css"
type="text/css" />

<link rel="stylesheet"
href="/localhost/jc/templates/beez_20/css/personal.c
ss" type="text/css" /> 17

Conditional Stylesheets
<?php if ($this->direction == 'rtl') : ?>
<link rel="stylesheet" href="<?php echo
$this->baseurl ?>/templates/<?php echo
$this->template; ?>/css/template_rtl.css"

type="text/css" />
<?php endif; ?>

18

Conditional Positions
<?php if ($this->countModules('position-12')): ?>
<div id="top">
<jdoc:include type="modules" name="position-12" />
</div>

<?php endif; ?>

19

One Line If Statement
$showRightColumn =
($this->countModules('position-3') OR
$this->countModules('position-6') OR
$this->countModules('position-8'));

<div id="<?php echo
$showRightColumn ? 'contentarea2' : 'contentarea';
?>">

If there are right modules: <div id="contentarea2">
If there aren't: <div id="contentarea"> 20

Module Layout
• Latest Articles
• mod_articles_latest/tmpl/default.php

21

PHP for HTML Gurus - J and Beyond 2012

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