University of Washington CSE 154

Section 3: Floating, Basic PHP

Except where otherwise noted, the contents of this document are Copyright © Marty Stepp, Jessica Miller, and Victoria Kirst. All rights reserved. Any redistribution, reproduction, transmission, or storage of part or all of the contents in any form is prohibited without the author's expressed written permission.

IMPORTANT notes this week

Free Floating Inline Elements: All inline elements must be enclosed inside of a block element. This includes text, don't let it float free!
Class/ID Overuse: Be careful to not overuse classes and ids when a context selector would work just as well.
Redundancy in CSS: If there are multiple rules that have the same style they are redundant. There should be a single rule with that style. Example from the last homework:

h1, h2, a {
    color: #A4A400;
};

Exercise : Float Boxes (by Alex Miller)

Generate the following page appearance, starting from this HTML and CSS code.

Exercise starter code

<div id="outer">
	<div class="box"></div>
	<div class="box"></div>
	<div class="box"></div>        
	<div class="box"></div>
	<div class="box"></div>
	<div class="box"></div>
</div>

#outer {
	border: 2px dashed black;
	padding: 10px;
}

.box {
	width: 100px;
	height: 100px;
	background-color: black;
	margin: 10px;
}

Exercise solution

<div id="outer">
	<div class="box"></div>
	<div class="box"></div>
	<div class="box"></div>
	<div class="box break"></div>  
	<div class="box"></div>
	<div class="box"></div>
</div>

#outer {
	border: 2px dashed black;
	overflow: hidden;
	padding: 10px;
}
.box {
	width: 100px;
	height: 100px;
	background-color: black;
	margin: 10px;
	float: left;
}
.break {
	clear: left;
}

Exercise : Menu (by Alex Miller)

Generate roughly the given appearance, starting from this HTML.

<ul>
	<li>Bananas</li>
	<li>Apples</li>
	<li>Grapefruit</li>
	<li>Oranges</li>
	<li>Papaya</li>
</ul>

Bananas
Apples
Grapefruit
Oranges
Papaya

Exercise solution

ul {
	background-color: red;
	padding: 20px;
	text-align: center;
}

li {
	display: inline;
	border: 1px solid black;
	padding: 10px;
	background-color: white;
}

Exercise : Layout2

Add CSS/HTML to this HTML code to generate the layout on the next slide. You can add div, span, class, and id but nothing else.

<h1>Header</h1>

<h2>Area 1</h2>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing ...</p>

<h2>Area 2</h2>
<p>Lorem ipsum dolor sit amet, consectetur ...</p>

<h2>Area 3</h2>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, ...</p>

Exercise expected layout

overall width 500px; column width 100px; 10px spacing around various elements
background colors: yellow, lightgray, lightblue; all fonts default

Header

Area 1

Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua...

Area 2

Lorem ipsum dolor sit amet, consectetur ...

Area 3

Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.

Exercise solution

<div id="container">
	<h1>Header</h1>

	<div id="column1">
		<h2>Area 1</h2>
		<p>Lorem ipsum ...</p> 
	</div>

	<div id="column2">
		<h2>Area 2</h2>
		<p>Lorem ipsum ...</p>
	</div>

	<h2>Area 3</h2>
	<p>Lorem ipsum ...</p>
</div>

#container {
	background-color: lightgray;
	overflow: hidden;
	padding: 10px;
	width: 500px;
}
#column1, #column2 {
	background-color: lightblue;
	float: right;
	margin-left: 10px;
	width: 100px;
}
h1 {
	background-color: yellow;
}

Exercise : Kitties (by Alex Miller)

Given 5 image files (kittie1.jpg, kittie2.jpg, etc.), write a PHP page that displays all 5 images as seen here (view source on output to get starter code!).

Exercise solution

<!DOCTYPE html>
<html>
  <head>
	 <title>kitties</title>
  </head>
  <body>
	<div>
	  <?php for ($i = 1; $i <= 5; $i++) { ?>
	  	<img src="kittie<?= $i ?>.jpg" />
	  <?php } ?>
	</div>
  </body>
</html>

Exercise : Buggy PHP

The following PHP pages each contain one or more bugs. The bugs could be syntax errors or incorrect logic. Look at each page, find the bug(s), and correct the errors.

buggy page 1 (source) - variables, strings, if/else
buggy page 2 (source) - variables, if/else, comments
buggy page 3 (source) - variables, for loops, string concatenation
buggy page 4 (source) - arrays, foreach
buggy page 5 (source) - arrays, foreach

Exercise debugging tips

Look at the error messages, if any, and examine those lines in your PHP source file. (You may need to enable line numbers in your editor.)
Check for mismatched brackets. Many editors support bracket matching.
PHP's error messages are not very friendly, often mentioning internal terms like T_VARIABLE and $end. If you don't understand an error, try Googling for the error message.
If there is no error message, try printing the value of variables at various points in the code. Use print for simple variables and print_r or var_dump for arrays and objects.

Exercise solutions

Exercise : Fibonacci (by Rishi Goutam)

Modify the following HTML to print the first 20 Fibonacci numbers in an ordered list using PHP. Recall that in the Fibonacci sequence, each number is the sum of the two previous numbers, with the first and second numbers being 0 and 1.

<!DOCTYPE html>
<html>
	<head>
		<title>Fibonacci Sequence</title>
	</head>
	<body>
		<h1>The first twenty Fibonacci numbers:</h1>

		<!-- (your code here!) -->
	</body>
</html>

Exercise solution

	...
		<h1>The first twenty Fibonacci numbers:</h1>
		<?php
		$first = 0;
		$second = 1;
		for ($i = 0; $i < 20; $i++) {
			?>
			<li><?= $first ?></li>
			<?php
			$temp = $second;
			$second += $first;
			$first = $temp;
		}
		?>