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PHP HYPERTEXT: PREPROCESSOR By: Justin T. Pleva

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WHAT IS PHP? General purpose Server-side web development Console application

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BACKGROUND First created in 1994 by Rasmus Lerdorf Designed to streamline web tasks Designed to access databases for storing data. Used for web forms First public release in 1995

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BACKGROUND Used primarily as website scripting Text Interpreter/filter Installed on over 20 million websites and domains Can install multiple versions Current version 5.4 Object-Oriented

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HISTORY Originally named Personal Homepage Tools Rewritten in 1997 using C, released publicly Renamed to Hypertext Preprocessor Version 4 introduced command line functionality Version 5 rewrote Object support Version 6 has been postponed

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LICENSING Open source PHP License Term PHP cannot be used directly in a project.

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OPERATING ENVIRONMENTS Windows Mac Linux Almost any others Built from source Web servers Apache IIS Lighttpd

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STACKS Comes bundled with many Linux Distributions Bundles for Mac: MAMP (Mac, Apache, MySQL, PHP) Linux: LAMP (Linux, Apache, MySQL, PHP) Windows: WAMP

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HOW IT WORKS Client Request sent to Web server Web server directs to PHP filter PHP processes data and sends to web server Web server sends back to client

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SYNTAX Similar to major programming languages C Java Can be embedded inside other languages such as HTML

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SYNTAX : DECLARATIONS Declared PHP code with delimiters ASP Style Code is only executed between these delimiters

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SYNTAX: VARIABLES Loosely typed, unlike C/Java // Create an integer and set equal to 3 $myVariable = 3; Prefixed name with $ Notice no type specified, this can be a string value of 3, character 3 or integer value of 3. Depends upon notation! Need to be careful with variable types!

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SYNTAX: COMMENTING Similar to other langues // This is a single line comment /* This is a block style comment */

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SYNTAX: FUNCTIONS Functions declarations similar to C/Java Function myFunction($value1, $value2) { return $value1 + $value2; } Can be value returning or not!

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SYNTAX: LOOPS Similar to C/Java For While Do While for each $i = 0; While ( $i != 5 ) { echo Number is: . $i. ; $i++; } Notice the .!

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SYNTAX: FILE HANDLING Can Open and write to file system Used to read/write from a server for web content Built in file support for: XML FTP Zip Cookies

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SYNTAX: GET/POST Can get data using $_Get[ ] Useful for retrieving data from url. Can send data using $_Post[ ] Useful for submitting user forms such as request information forms.

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SYNTAX: OBJECTS PHP is Object-Oriented Can create classes and objects of any type Similar to C/Java Can have private/public methods and data members Arrow notation instead of dot notation

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SYNTAX: MAIL Built in Email support Create text based email Send via 1 function.

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FILE EXTENSIONS Standard extension:.php Can have others .phtml .php5 If multiple versions are installed,.php5 will refer to version 5 installed

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USAGE Command line Dynamic websites Content Management Can be used for Desktop applications GUI controls

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DATABASE SUPPORT Built to work primarily with MySQL Capable of working with others: MS SQL Oracle Postgres PDO Driver

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SECURITY Very little security holes have been found with core PHP application Security risks come from each individual programmer, not the PHP filter! Bad programming habits

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WEB PRESENCE 20 Million domains/websites Comes pre installed with many Linux distributions. Content Management Systems

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WEB PRESENCE: CMS Many Content Management Systems are built with PHP Joomla Wordpress Drupal Far more built with PHP than others such as.Net

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COMMUNITY SUPPORT Need help? Google it. Since PHP is so widely used, there is great community support Content Management Systems are sometimes community built

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SCRIPT AVAILABILITY Community Support Open Source http://www.hotscripts.com http://www.hotscripts.com

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DEVELOPMENT Code in Notepad IDE Support Netbeans Zend Studio Eclipse Codelobster

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CONCLUSION General Scripting lanaguage Over 20 million domains Command line/Web server-side Various database support Thousands of pre-built scripts Open source

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QUESTIONS?