|Works for||Mainly backend purpose||Both frontend and backend|
|Runs||Over a server||In a browser|
|Merged with||HTML||HTML, AJAX and XML|
|Characteristics||Multithreaded language||Single threaded language and event-driven|
|Availability of the code||Only available after the server interprets it.||Code can be viewed even after the output is interpreted.|
|Integrated database||MySQL||Does not provide database connectivity.|
Definition of PHP
PHP stands for the Hypertext Preprocessor, an interpreted programming language used in the construction of the dynamic, interactive Web sites. Here, the terms dynamic and interactive referred to represent a website whose content alters each time automatically whenever a page is viewed and also generate a response to the input given by its visitors respectively. To run PHP program one require a web server and this is how the web pages are served to the visitors upon a request. The PHP code can be embedded within HTML web pages which facilitate in the creation of the dynamic content swiftly.
PHP is a programming language used at the server-side and provides a particular run-time environment to execute the tasks in an automated way. The PHP scripts and programs execute on a web server and processed by a PHP engine. The process of executing a PHP script on a web server would appear like as following:
- At first, the visitor clicks a link to request a web page, or by typing a web address in the address bar of a browser. Simultaneously, the visitor can send data to the web server.
- The next operation is performed by a web server in which it recognizes the requested URL and directs the PHP engine to process and execute the script.
- In the end, the script is executed and generates an HTML page to the web browser visible on the screen as a response to the requested page by the visitor.
- PHP is cross-platform; it can run on any of the operating systems like Windows, Linux, Solaris, Mac OS, etcetera.
- It can be integrated with other more powerful web servers.
- PHP is an open source language which means one not needs to pay for using it.
- Error reporting is easier due to the use of predefined error reporting constants.
- It provides real-time access monitoring.
- It is also a loosely typed language.
- It has a powerful object literal notation, where the objects are created by just listing their components.
- It relies on the global variable for linkage hence uses a common namespace for top-level variables and compilation units.
Key Differences Between For and Foreach in PHP