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PHP originally stood for Personal Home Page. Lerdorf initially created these Personal Home Page Tools to replace a small set of Perl scripts he had been using to maintain his personal homepage. The tools were used to perform tasks such as displaying his résumé and recording how much traffic his page was receiving.
Lerdorf released PHP publicly on June 8, to accelerate bug location and improve the code. This release was named PHP version 2 and already had the basic functionality that PHP has today. This included Perl-like variables, form handling, and the ability to embed HTML. The syntax was similar to Perl but was more limited, simpler, and less consistent.
Afterwards, public testing of PHP 3 began, and the official launch came in June They also founded Zend Technologies in Ramat Gan, Israel. On May 22, , PHP 4, powered by the Zend Engine 1. On July 13, , PHP 5 was released, powered by the new Zend Engine II. PHP 5 included new features such as improved support for object-oriented programming, the PHP Data Objects extension which defines a lightweight and consistent interface for accessing databases , and numerous performance enhancements.
The most recent update released by The PHP Group is for the older PHP version 4 code branch. Late static binding has been missing from PHP and will be added in version 5.
PHP 6 is under development alongside PHP 5. PHP does not have complete native support for Unicode or multibyte strings; Unicode support will be included in PHP 6. Many high profile open source projects ceased to support PHP 4 in new code as of February 5, , due to the GoPHP5 initiative, provided by a consortium of PHP developers promoting the transition from PHP 4 to PHP 5.
It runs in both bit and bit environments, but on Windows the only official distribution is bit, requiring Windows bit compatibility mode to be enabled while using IIS in a bit Windows environment. There is a third-party distribution available for bit Windows. Usage PHP is a general-purpose scripting language that is especially suited for web development. PHP generally runs on a web server, taking PHP code as its input and creating web pages as output.
It can also be used for command-line scripting and client-side GUI applications. PHP can be deployed on most web servers, many operating systems and platforms, and can be used with many relational database management systems.
It is available free of charge, and the PHP Group provides the complete source code for users to build, customize and extend for their own use. It can automatically detect the language of the user. From PHP 4, the PHP parser compiles input to produce bytecode for processing by the Zend Engine, giving improved performance over its interpreter predecessor.
PHP has also attracted the development of many frameworks that provide building blocks and a design structure to promote rapid application develo- pment RAD.
Some of these include CakePHP, Symfony, CodeIgniter, and Zend Framework, offering features similar to other web application frameworks. The LAMP architecture has become popular in the web industry as a way of deploying web applic- ations. PHP is commonly used as the P in this bundle alongside Linux, Apache and MySQL, although the P may also refer to Python or Perl.
As of April , over 20 million Internet domains were hosted on servers with PHP installed, and PHP was recorded as the most popular Apache module. Significant websites are written in PHP including the user- facing portion of Facebook, Wikipedia MediaWiki , Yahoo! In addition to server-side scripting, PHP can be used to create stand-alone, compiled applications and libraries, it can be used for shell scripting, and the PHP binaries can be called from the command line.
In this case, PHP scripts will be compiled at runtime by the PHP engine, which increases their execution time. PHP scripts are able to be compiled before runtime using PHP compilers as with other programming languages such as C the language PHP and its extensions are written in. Code optimizers aim to reduce the computational complexity of the compiled code by reducing its size and making other changes that can reduce the execution time with the overall goal of improving performance.
The nature of the PHP compiler is such that there are often opportunities for code optimization, and an example of a code optimizer is the Zend Optimizer PHP extension. Another approach for reducing overhead for high load PHP servers is using PHP accelerators. These can offer significant performance gains by caching the compiled form of a PHP script in shared memory to avoid the overhead of parsing and compiling the code every time the script runs. Most of these PHP-related vulnerabilities can be exploited remotely: they allow hackers to steal or destroy data from data sources linked to the webserver such as an SQL database , send spam or contribute to DOS attacks using malware, which itself can be installed on the vulnerable servers.
These vulnerabilities are caused mostly by not following best practice programming rules: technical security flaws of the language itself or of its core libraries are not frequent. Recognizing that programmers cannot be trusted, some languages include taint checking to detect automatically the lack of input validation which induces many issues.
However, such a feature is being developed for PHP Hosting PHP applications on a server requires a careful and constant attention to deal with these security risks.
There are advanced protection patches such as Suhosin and Hardening-Patch, especially designed for web hosting environments. Installing PHP as a CGI binary rather than as an Apache module is the preferred method for added security. With respect to securing the code itself, PHP code can be obfuscated to make it difficult to read while remaining functional.
Anything outside its delimiters is sent directly to the output and is not parsed by PHP. php and? For this reason, the use of short tags and ASP-style tags is discouraged.
The purpose of these delimiters is to separate PHP code from non-PHP code, including HTML. Variables are prefixed with a dollar symbol and a type does not need to be specified in advance. Unlike function and class names, variable names are case sensitive. PHP treats newlines as whitespace in the manner of a free-form language except when inside string quotes , and statements are terminated by a semicolon.
The echo statement is one of several facilities PHP provides to output text e. to a web browser. In terms of keywords and language syntax, PHP is similar to most high level languages that follow the C style syntax. This range is typically that of bit signed integers. Unsigned integers are converted to signed values in certain situations; this behavior is different from other programming languages. Integer variables can be assigned using decimal positive and negative , octal, and hexadecimal notations.
Floating point numbers are also stored in a platform-specific range. They can be specified using floating point notation, or two forms of scientific notation. The null data type represents a variable that has no value. These are typically created by functions from a particular extension, and can only be processed by functions from the same extension; examples include file, image, and database resources.
Arrays can contain elements of any type that PHP can handle, including resources, objects, and even other arrays. Order is preserved in lists of values and in hashes with both keys and values, and the two can be intermingled. PHP also supports strings, which can be used with single quotes, double quotes, or heredoc syntax. The Standard PHP Library SPL attempts to solve standard problems and implements efficient data access interfaces and classes. These functions are well documented on the PHP site, but unfortunately, the built-in library has a wide variety of naming conventions and inconsistencies.
PHP currently has no functions for thread programming. Version 5. User-defined functions can be created at any time without being prototyped. Functions can be defined inside code blocks, permitting a run-time decision as to whether or not a function should be defined.
Function calls must use parentheses, with the exception of zero argument class constructor functions called with the PHP new operator, where parentheses are optional. Such a function can be stored, given as the parameter to another functions, etc. For more details see Lambda functions and closures RFC. Object handling was completely rewritten for PHP 5, expanding the feature set and enhancing performance.
In previous versions of PHP, objects were handled like primitive types. The drawback of this method was that the whole object was copied when a variable was assigned or passed as a parameter to a method.
In the new approach, objects are referenced by handle, and not by value. PHP 5 introduced private and protected member variables and methods, along with abstract classes and final classes as well as abstract methods and final methods. Furthermore, PHP 5 added interfaces and allowed for multiple interfaces to be implemented. There are special interfaces that allow objects to interact with the runtime system. Objects implementing ArrayAccess can be used with array syntax and objects implementing Iterator or IteratorAggregate can be used with the foreach language construct.
There is no virtual table feature in the engine, so static variables are bound with a name instead of a reference at compile time. For convenience, the engine will supply a function that imports the properties of the source object, so that the programmer can start with a by-value replica of the source object and only override properties that need to be changed.
PHP is a fundamentally Internet- aware system with modules built in for accessing FTP servers, many database servers, embedded SQL libraries such as embedded PostgreSQL, MySQL and SQLite, LDAP servers, and others.
Many functions familiar to C programmers such as those in the stdio family are available in the standard PHP build. This leads to confusion over which data is escaped and which is not, and to problems when data is not in fact used as input to a database and when the escaping used is not completely correct.
To make code portable between servers which do and do not use magic quotes, developers can preface their code with a script to reverse the effect of magic quotes when it is applied.
PHP allows developers to write extensions in C to add functionality to the PHP language. These can then be compiled into PHP or loaded dynamically at runtime. Extensions have been written to add support for the Windows API, process management on Unix-like operating systems, multibyte strings Unicode , cURL, and several popular compression formats. Some more unusual features include integration with Internet Relay Chat, dynamic generation of images and Adobe Flash content, and even speech synthesis.
The PHP Extension Community Library PECL project is a repository for extensions to the PHP language. Zend provides a certification exam for programmers to become certified PHP developers. A database management system DBMS such as Access, FileMaker Pro, Oracle or SQL Server provides you with the software tools you need to organize that data in a flexible manner. It includes facilities to add, modify or delete data from the database, ask questions or queries about the data stored in the database and produce reports summarizing selected contents.
MySQL is a multithreaded,multi-user SQL database management system DBMS. The basic program runs as a server providing multi-user access to a number of databases. Originally financed in a similar fashion to the JBoss model, MySQL was owned and sponsored by a single for-profit firm, the Swedish company MySQLAB now a subsidiary of Sun Microsystem , which holds the copyright to most of the codebase.
MySQL is a database. The data in MySQL is stored in database objects called tables. A table is a collections of related data entries and it consists of columns and rows. Databases are useful when storing information categorically. Each table is identified by a name e. Tables contain records rows with data. With MySQL, we can query a database for specific information and have a recordset returned.
This function is used to send a query or command to a MySQL connection. Whether you enjoy the control of hand-coding HTML or prefer to work in a visual editing environment, Dreamweaver provides you with helpful tools to enhance your web creation experience. The visual editing features in Dreamweaver let you quickly create pages without writing a line of code.
You can view all your site elements or assets and drag them from an easy-to-use panel directly into a document. You can streamline your development workflow by creating and editing images in Macromedia Fireworks or another graphics application, then importing them directly into Dreamweaver, or by adding Macromedia Flash objects. Macromedia Roundtrip HTML technology imports your hand-coded HTML documents without reformatting the code; you can then reformat code with your preferred formatting style.
Dreamweaver also enables you to build dynamic database-backed web applications using server technologies such as CFML, ASP. NET, ASP, JSP, and PHP.
Examples of accessibility features for software products and websites include screen reader support, text equivalents for graphics, keyboard shortcuts, change of display colors to high contrast, and so on. Dreamweaver provides tools that make the product accessible and tools that help you author accessible content: Using Dreamweaver accessibility features For Dreamweaver web designers who need to use accessibility features, Dreamweaver offers screen reader support, keyboard navigation, and operating system accessibility support.
For more information, see Using Dreamweaver accessibility features. Authoring for accessibility For Dreamweaver web designers who need to create accessible content, Dreamweaver assists you in creating accessible pages that contain useful content for screen readers and comply with government guidelines.
Dreamweaver provides dialog boxes that prompt you to enter accessibility attributes when you insert page elements see Optimizing the workspace for accessible page design. For example, the accessibility dialog box for images reminds you to add text equivalents for graphics. Then, when the image appears on a page for a user with visual disabilities, the screen reader reads the description.
You can either insert div tags manually and apply CSS positioning styles to them, or you can use Dreamweaver layers to create your layout. A layer in Dreamweaver is an HTML page element—specifically, a div tag, or any other tag—that has an absolute position assigned to it.
Whether you use CSS, tables, or frames to lay out your pages, Dreamweaver has rulers and grids for visual guidance in your layout. Dreamweaver also has a tracing image feature, which you can use to re-create a page design that was created in a graphics application.
Client-side role of forms Forms support the client side of the client-server relationship. When a visitor enters information into a form displayed in a web browser the client and clicks the submit button, the information is sent to the server where a server-side script or application processes it. Common server-side technologies used for processing form data include Macromedia ColdFusion, Microsoft Active Server Pages ASP , and PHP.
Note : - See Appendix 1 for more about Macromedia Dreamweaver 8 and phpMyAdmin 2. phpMyAdmin supports a wide range of operations with MySQL. while you still have the ability to directly execute any SQL statement. phpMyAdmin can manage a whole MySQL server needs a super-user as well as a single database. When a user logs in to phpMyAdmin, that username and password are passed directly to MySQL. phpMyAdmin does no account management on its own other than allowing one to manipulate the MySQL user account information ; all users must be valid MySQL users.
Proper support may also need changes in php. a phpMyAdmin screen appears as shown below. o To support uploading of ZIP files, you need the PHP zip extension. o For proper support of multibyte strings eg. UTF-8, which is currently default , you should install mbstring and ctype extensions. Not using mcrypt will cause phpMyAdmin to load pages significantly slower.
The first version of Apache, based on the NCSA httpd Web server, was developed in Core development of the Apache Web server is performed by a group of about 20 volunteer programmers, called the Apache Group. However, because the source code is freely available, anyone can adapt the server for specific needs, and there is a large public library of Apache add-ons. In many respects, development of Apache is similar to development of the Linux operating system.
The name is a tribute to the Native American Apache Indian tribe, a tribe well known for its endurance and skill in warfare. A common misunderstanding is that it was called Apache because it was developed from existing NCSA code plus various patches, hence the name a patchy server, or Apache server.
Apache has attracted so much interest because it is full-featured, reliable, and free. One aspect of Apache that some site administrators find confusing — especially those unfamiliar with UNIX-style software — is its configuration scheme.
Instead of using a point-and-click graphic user interface GUI or Windows Registry keys as most other modern software packages, Apache generally relies on simple text files for its configuration settings. conf for general settings 2. conf for resource settings 3. conf for security settings When Apache first starts, these files are processed in the order shown above.
Originally, the initial installation of Apache included default entries within each of the three files. In the most recent versions of Apache, however, the default installation has changed.
Now httpd. Both srm. conf and access. conf still exist in the installation, but they contain no settings and are empty except for some comments.
Inside Httpd. conf Traditionaly httpd. conf contained general settings such as the ServerName and Port number. These entries appear as follows in the file: ServerName compnetworking. Recall that in a UNIX environment, the term daemon refers to a type of process designed to launch at system boot and continue running for very long periods of time.
This file contains a number of other entries technically called directives , but for most of these,modifications are optional. Probably the most useful of these entries is ServerAdmin. Access and Security Settings It is recommended practice now for Apache administrators to manage their resource and security settings from httpd.
Administrators of older versions of Apache can simply cut their entries from srm. conf and paste them into the master file. If an administrator wants to go one step further and delete the two empty files, they should also place the following entries in httpd. conf to prevent Apache from attempting to access them. Thereby the number of hostels are also increasing for the accommodation of the students studying in this institution.
This particular project deals with the problems on managing a hostel and avoids the problems which occur when carried manually Identification of the drawbacks of the existing system leads to the designing of computerized system that will be compatible to the existing system with the system which is more user friendly and more GUI oriented. We can improve the efficiency of the system, thus overcome the following drawbacks of the existing system.
The Administrator can allot different students to the different hostels. He can vacate the students for the hostels. He can control the status of the fee payement. He can edit the details of the students. He can change their rooms, edit and delete the student records. A process of converting user originated inputs to a computer-based format. Input design is an important part of development process since inaccurate input data are the most common cause of errors in data processing.
Erroneous entries can be controlled by input design. It consists of developing specifications and procedures for entering data into a system and must be in simple format. The goal of input data design is to make data entry as easy, logical and free from errors as possible.
In input data design, we design the source document that capture the data and then select the media used to enter them into the computer. There are two major approaches for entering data in to the computer. They are · Menus. Menus A menu is a selection list that simplifies computer data access or entry. Instead of remembering what to enter, the user chooses from a list of options. A menu limits a user choice of response but reduce the chances for error in data entry.
It allows the display of bitmaps and pictures. It can have various controls like buttons, text boxes, list boxes and combo boxes. The proposed system has three major inputs. They are Machine Registration, Machine Scheduling and Request Form.
In order to understand the working procedure, process design is necessary. Data Flow Diagram and System Flow chart are the tools used for process design. System Flow Chart is a graphical representation of the system showing the overall flow of control in processing at the job level; specifies what activities must be done to convert from a physical to logical model.
Data Flow Diagram is the logical representation of the data flow of the project. The DFD is drawn using various symbols. It has a source and a destination. The process is represented using circles and source and destination are represented using squares.
The data flow is represented using arrows. One reader can easily get the idea about the project through Data Flow Diagram. Designing the database is part of system design. Data elements and data structures to be stored have been identified at analysis stage. They are structured and put together to design the data storage and retrieval system.
A database is a collection of interrelated data stored with minimum redundancy to serve many users quickly and efficiently. The general objective is to make database access easy, quick, inexpensive and flexible for the user. Relationships are established between the data items and unnecessary data items are removed. Normalization is done to get an internal consistency of data and to have minimum redundancy and maximum stability. This ensures minimizing data storage required, minimizing chances of data inconsistencies and optimizing for updates.
The MS Access database has been chosen for developing the relevant databases. Student account creation 2. Allotment 5. Notice Board 4. When we design an output we must identify the specific output that is needed to meet the system.
The usefulness of the new system is evaluated on the basis of their output. Once the output requirements are determined, the system designer can decide what to include in the system and how to structure it so that the require output can be produced. For the proposed software, it is necessary that the output reports be compatible in format with the existing reports.
It consists of developing specifications and procedures for data preparation, those steps necessary to put the inputs and the desired output, ie maximum user friendly. Proper messages and appropriate directions can control errors committed by users. The output design is the key to the success of any system. Output is the key between the user and the sensor.
Output design consists of displaying specifications and procedures as data presentation. User never left with the confusion as to what is happening without appropriate error and acknowledges message being received.
Even an unknown person can operate the system without knowing anything about the system. Testing is the process of executing the program with the intent of finding errors and missing operations and also a complete verification to determine whether the objectives are met and the user requirements are satisfied. The ultimate aim is quality assurance. Tests are carried out and the results are compared with the expected document. In the case of erroneous results, debugging is done.
Using detailed testing strategies a test plan is carried out on each module. Unit testing focuses first on modules, independently of one another, to locate errors. This enables, to detect errors in coding and logic that are contained within each module.
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