php tutorial by cyber security infotech(csi)
TRANSCRIPT
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PHP TUTORIAL BY CYBER SECURITY INFOTECH (CSI)
http://www.csinfotech.org/
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About the company : Cs-infotech is one of the best cyber security and
website development company in India. we also provide Network security, software development, Cyber security corporate training and SEO and SMO services.
Our services are Employee Monitoring System, Employee Monitoring Software, Website Audit , Network Security , Network Audit and Information Security.
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Agenda
Introduction PHP Language Basics Built-in Functions PHP on Linux and Windows Tricks and Tips PHP 5 Examples Questions?
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Introduction What 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
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Introduction History 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
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Introduction History of PHP (cont.)
Rewritten again in and released as version 2.0 in November of 1997
Estimated user base in 1997 is several thousand users and 50,000 web sites served
Rewritten again in late 1997 by Andi Gutmans and Zeev Suraski
More functionality added, database support, protocols and APIs
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Introduction History of PHP (cont.)
User base in 1998 estimated 10,000 users and 100,000 web sites installed
Version 3.0 was released in June 1998 as PHP
Estimated user base in tens of thousands and hundreds of thousands of web sites served
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Introduction History of PHP (cont.)
Rewritten again in 1997 by Andi Gutmans and Zeev Suraski
More functionality added (OOP features), database support, protocols and APIs
PHP 3.0 is released in June 1998 with some OO capability
The core is rewritten in 1998 for improved performance of complex applications
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Introduction History of PHP (cont.)
The core is rewritten in 1998 by Zeev and Andi and dubbed the “Zend Engine”
The engine is introduced in mid 1999 and is released with version 4.0 in May of 2000
The estimated user base is hundreds of thousands of developers and several million of web sites served
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Introduction History of PHP (cont.)
Version 5.0 will include version 2.0 of the Zend Engine New object model is more powerful and
intuitive Objects will no longer be passed by value; they
now will be passed by reference Increases performance and makes OOP more
attractive
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Introduction Netcraft Statistics
11,869,645 Domains, 1,316,288 IP Addresses
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Introduction Performance*
Zdnet Statistics PHP pumped out about 47 pages/second Microsoft ASP pumped out about 43
pages/second Allaire ColdFusion pumped out about 29
pages/second Sun Java JSP pumped out about 13
pages/second
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PHP Language Basics The Script Tags
All PHP code is contained in one of several script tags: <?
// Some code?>
<?php// Some code here?>
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PHP Language Basics The Script Tags (cont.)
<script language=“PHP"> // Some code here</script>
ASP-style tags Introduced in 3.0; may be removed in the
future <%
// Some code here%>
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PHP Language Basics The Script Tags (cont.)
“Echo” Tags <table>
<tr> <td>Name:</td><td><?= $name ?></td></tr><tr> <td>Address:</td><td><?= $address ?></td></tr></table>
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PHP Language Basics Hello 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?>
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PHP Language Basics Hello World!: An Example (cont.)
<script language=“PHP”> $hello = “Hello”; $world = “World!”; print $hello . $world</script>
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PHP Language Basics Constants, 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”);
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PHP Language Basics Constants, Data Types and Variables
Using a constant print(“Company name: “ . COMPANY . NL);
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PHP Language Basics Constants, Data Types and Variables
Data types Integers, doubles and strings
isValid = true; // Boolean 25 // Integer 3.14 // Double ‘Four’ // String “Total value” // Another string
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PHP Language Basics Constants, 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
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PHP Language Basics Constants, Data Types and Variables
Data types Arrays
Perl-like syntax $arr = array("foo" => "bar", 12 => true);
same as $arr[“foo”] = “bar”; $arr[12] = true;
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PHP Language Basics Constants, 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 $arr["somearray"]["a"]; // 42?>
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PHP Language Basics Constants, Data Types and Variables
Objects Currently not much more advanced than than
associative arrays Using constants Before version 5.0, objects are passed by value
Slow Functions can not easily change object
variables
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PHP Language Basics Constants, Data Types and Variables
Operators Contains all of the operators like in C and Perl
(even the ternary) Statements
if, if/elseif Switch/case for, while, and do/while loops Include and require statements for code reuse
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Built-in Functions What comes In the box?
Array Manipulator Functions sort, merge, push, pop, slice, splice, keys,
count CCVS: Interface to Red Hat’s credit system COM functions: Interface to Windows COM
objects Date and Time Functions
getdate, mkdate, date, gettimeofday, localtime, strtotime, time
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Built-in Functions What comes In the box?
Directory Functions Platform independent
Error Handling Functions Recover from warnings and errors
Filesystem Functions Access flat files Check directory, link, and file status
information Copy, delete, and rename files
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Built-in Functions What comes In the box?
IMAP Functions Manipulate mail boxes via the IMAP protocol
LDAP Functions Works with most LDAP servers
Mail Functions mail($recipient, $subject, $message)
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Built-in Functions What comes In the box?
Database Functions dba: dbm-style abstraction layer dBase Frontbase Informix Ingres II Interbase mSQL
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Built-in Functions What comes In the box?
Database Functions (cont.) MySQL Oracle PostgreSQL SQL Server
MING Macromedia Flash
PDF Create/manipulate PDF files dynamically
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Built-in Functions What comes In the box?
POSIX Functions Manipulate process information
Regular Expression Functions Uses POSIX regex
Semaphore and Socket Functions Available only on Unix
Session Management Functions
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PHP on Linux and Windows Code Portability
The obvious: don’t use Unix or Windows specific functions
Create a reusable module for file system differences, for example:
if( PHP_OS == "Linux" ){ $ConfigPath = "/var/www/conf"; $DataPath = "/var/www/data";}
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PHP on Linux and Windows Code Portability
if( ereg("WIN", PHP_OS) ){ $ApachePath = “C:/Program Files/Apache Group/Apache”; $ConfigPath = ”$ApachePath/htdocs/conf"; $DataPath = "$ApachePath/htdocs/data";}
$ConfigFile = "$ConfigPath/paperwork.conf";$CountryList = "$DataPath/countries.txt";$StateAbbrList = "$DataPath/usstateabbrs.txt";$StateNameList = "$DataPath/usstatenames.txt";
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Tricks and Tips Coding
Prototype your web pages first Separate the design of the site from the coding
Turn repetitive code into functions Makes for more maintainable and reusable
code Turn grunt code into functions
Database access, configuration file access
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Tricks and Tips Debugging
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
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Tricks and Tips Debugging
Use scripts to dump form and session variables Write scripts to dump data to discover bad or
missing data
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Tricks and Tips Development Tools
Color coding editors vim, Emacs, Visual SlickEdit
IDEs Windows
Macromedia Dreamweaver Allaire Homesite Zend’s PHPEdit
Linux ???
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PHP 5 Release Date
??? Features
Complete objects Objects with constructors Abstract classes Private, protected and abstract functions Private, protected and constant variables Namespaces Exception handling with try/catch blocks
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Resources PHP Downloads and Online Documentation
www.php.net Community
www.phpbuilder.com: articles on PHP, discussion forums
www.phpresourceindex.com: over 1,000 PHP scripts
www.phpvolcano.com: PHP 5 information Newsgroups
comp.lang.php
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Thank you …