PHP

What is PHP?

• PHP stands for PHP: Hypertext Preprocessor

• PHP is a server-side scripting language, which could
be imbedded to HTML

• PHP scripts are executed on the server

• PHP supports many databases

• PHP is an open source software, free to download
and use

2

PHP Syntax

<?php
….
?>

<html>
<body>
<?php
echo “Hello World”;
?>
</body>
</html>

3

Text Editors

• Dreamweaver Open as php and add code in code
view. Use: Insert > php.
• Windows Notepad Make sure your files are saved
with the .php extension.
• Microsoft Word is not optimal for editing PHP files.
If you use it, you must save the file as plain text.

4

.html or .php: where

**Inline** **html code with echo and print*
<html>
<?php
<head>
<title>HTML with PHP</title> echo "<html>";
</head> echo "<title>HTML with PHP</title>";
<body> echo "<h1>My example</h1>";
<h1>My Example</h1>
//your php code here.
<?php
//your php code here print "<i>Print works too!</i>";
?>
echo “</html>”;
<b>Here is some more html.</b>
<?php ?>
//your php code here
?>
</body>
</html> 5

.html or .php??

• Open new > Page type: php
• Save as .php

6

Variables

• Variables are used for storing a values, like text
strings, numbers or arrays.
• When a variable is declared, it can be used over and
over again in your script.
• All variables in PHP start with a $ sign symbol.
• The correct way of declaring a variable in PHP:

$name = value;

7

Naming Rules for Variables

• A variable name must start with a letter or an underscore
“_”
• A variable name can only contain alpha-numeric
characters and underscores (a-z, A-Z, 0-9, and _ )
• A variable name should not contain spaces. If a variable
name is more than one word, it should be separated with
an underscore ($my_string), or with capitalization
($myString)

8

The Concatenation Operator

The concatenation operator . is used to put two string together.

<?php
$txt1=“Hello World!”;
$txt2=“What a nice day!”;
echo $txt1 . “ ” . $txt2;
?>

9

Comments

• Comments can be added to explain the
PHP.

• Single line comments start with //.

• Multi line comments start with /* and end
with */

10

if…else Syntax

<?php
if (condition1)
{code to be executed if condition1 is true};
elseif (condition2)
{code to be executed if condition2 is true};
else
{code to be executed if condition1 and condition2
are not true};
?>

11

if…else Example

<?php
$num1=10;
$num2=20;
if ($num1>$num2)
echo “The first number is greater than the second.<br />”;
elseif ($num1<$num2)
{echo “The first number is smaller than the second.<br />”;
echo “too bad”;
}
else
echo “The first number is equal to the second.<br />”;
?>

12

For Loop Syntax

The for loop is used when you know in advance how
many times the script should run.

for (initial condition; end condition; increment)
{
code to be executed;
}

13

For Loop Example

<?php
for ($i=0; $i<=5; $i++)
{
echo "The number is " . $i;
echo “.<br />”;
}
?>

14

While Loop Syntax

Initial variable;

while (end variable)
{
code to be executed;

variable increment;
}

15

While Loop Example

<php?
$i=0;
while ($i<=5)
{
echo "The number is " . $i . “.<br />”;
$i++;
}
?>

16

Function Syntax

• need to be called in order to execute
• Can be called multiple times with different variables

function funname(var1, var2)
{
function code;
}

funname(var1, var2);

17

Function Example

<?php

function getGreeting($user){

return “Hello, $user!”;

}

echo getGreeting(„Toby‟);

?>

18

Function Example

function caltax($num1)

{$tax=0.0875;

$total = $num1+($num1*$tax);

echo "The total is $” . $total . ". <br />”;

}

caltax(100);

19

Works Cited

Most of the information on this PowerPoint are based
on W3Schools Online Web Tutorials PHP section.

20

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