PHP stands for "PHP Hypertext Preprocessor”
An embedded scripting language for HTML like ASP or JSP
A language that combines elements of Perl, C, and Java
2. INTRODUCTION
hat is PHP?
• PHP stands for "PHP Hypertext Preprocessor”
• An embedded scripting language for HTML like ASP or JSP
• A language that combines elements of Perl, C, and Java
Guru99
3. Guru99
INTRODUCTION
istory of PHP
• Created by Rasmus Lerdorf in 1995 for tracking access to his resume
• Originally a set of Perl scripts known as the “Personal Home Page”
tools
• Rewritten in C with database functionality
• Added a forms interpreter and released as PHP/FI: includes Perl-like
variables, and HTML embedded syntax
4. PHP LANGUAGE BASICS
ello World!: An Example
• Like Perl, there is more than one way to do it
• <?php echo “Hello World!”; ?>
• <?php
$greeting = “Hello World!”
printf(“%s”, $greeting);
php?>
Guru99
5. PHP LANGUAGE BASICS
onstants, Data Types and Variables
• Constants define a string or numeric value
• Constants do not begin with a dollar sign
• Examples:
•
•
•
•
define(“COMPANY”, “Acme Enterprises”);
define(“YELLOW”, “#FFFF00”);
define(“PI”, 3.14);
define(“NL”, “<br>n”);
Guru99
6. PHP LANGUAGE BASICS
onstants, Data Types and Variables
• Using a constant
• print(“Company name: “ . COMPANY . NL);
Guru99
7. PHP LANGUAGE BASICS
onstants, Data Types and Variables
• Data types
• Integers, doubles and strings
• isValid = true; // Boolean
• 25
// Integer
• 3.14
// Double
• ‘Four’
// String
• “Total value” // Another string
Guru99
8. PHP LANGUAGE BASICS
onstants, Data Types and Variables
• Data types
• Strings and type conversion
• $street = 123;
• $street = $street . “ Main Street”;
• $city = ‘Naperville’;
$state = ‘IL’;
• $address = $street;
• $address = $address . NL . “$city, $state”;
• $number = $address + 1;
// $number equals 124
Guru99
9. PHP LANGUAGE BASICS
onstants, Data Types and Variables
• Data types
• Arrays
• Perl-like syntax
• $arr = array("foo" => "bar", 12 => true);
• same as
• $arr[“foo”] = “bar”;
• $arr[12] = true;
10. PHP LANGUAGE BASICS
onstants, Data Types and Variables
• Arrays (cont.)
• <?php
$arr = array("somearray" => array(6 => 5, 13 => 9,
"a" => 42));
echo $arr["somearray"][6]; // 5
echo $arr["somearray"][13]; // 9
echo $arr["somearray"]["a"]; // 42
?>
11. PHP LANGUAGE BASICS
onstants, Data Types and Variables
• Objects
• Currently not much more advanced than than associative arrays
Using constants
• Before version 5.0, objects are passed by value
• Slow
• Functions can not easily change object variables
12. TRICKS AND TIPS
ebugging
• Feature: PHP is not a strongly typed language
• Variables can be created anywhere in your code
• Undocumented Feature: PHP is not a strongly typed language
• Typos in variable names will cause stuff to happen
13. RESOURCES
• To Learn more thing about PHP
Just Visit our site
• http://web.guru99.com/
• Thank You