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Php
- 4. PHP (Hyper Text Pre-processor) is open source server side scripting language/software/tool which is used for creating powerful Dynamic Websites, Web Application and Desktop Applications. PHP is a free to use web programming language which is used for creating interactive websites. (Sever Side Language means it must require a Server for execution.)
- 5. PHP was originally created by Rasmus Lerdorf in 1995. PHP’s first version 1.0 was released in 1995 and its latest version is 5.5
- 7. Web Applications. i.e. means small SW such as calculators, convertors, visitor counters. Dynamic Websites. (means those sites that can communicate with user automatically) Social Networks.ie Facebook, Twitter &My Space etc. E-commerce online shopping stores i.e. OLX.com. News sites i.e. BBC.com, CNN.com etc. Desktop Applications data storing software, image editing software, image resizing software.
- 8. PHP code can be written inside HTML documents but PHP require a web server installed In order to executed. PHP is actually a softwaretool which is actually installed on a web server from where it perform the tasks given by the developer and return the output on the visitors within milliseconds.
- 10. First we start the installed wampServer from start menu or desktop Then it display in red color
- 11. After few seconds or in 1 minute it will change in green color We click on greened wampServer And than click on local host
- 12. Localhost home page will be appear after click on localhost Our folder (rida, kj) is show in home page which we create in “www” folder of wampServer
- 13. We click on folder and all files will be displayed on web page that are saved in folder and we click on file which we want
- 15. PHP syntax bit similar to other programming language such as Java and ASP. PHP can be written inside HTML document any where in the <body> section or in the <head> tag. A simple PHP script is written like this…. <?php (starting tag) Code goes here ?> (closing tag)
- 18. Echo is a command of PHP. Echo is used for displaying string, array, text or variables etc in browser. Echo is same as print. Perform same work But we mostly use echo instead of print. We can use html tags in echo command.
- 21. ◊ There are two types of variables in PHP. ◊ (1)Global (2)Local ◊ Global variables are also known as pre-defined variables. They can not be changed. ◊ Local variables are also known as temporary variables.You can create local variables by yourself. ◊ Global variables can be saved in local variables.
- 22. ⌂We use dollar sign for create a local variable. ⌂The name of variable always start with alphabets. ⌂If we assign alphabet value to a variable then we use “”. ⌂There is no need of double quotation for numeric values. ⌂We can save any type of data in local variable.
- 58. We break the loop for preserving from the error. Example: In any language we divide a number by 0, an error will be generated. Same case in php and we want to preserve these error, so we use break statement to break the loop.
- 59. A particular area will be skipped by the help of continues statement. We skip these area from loop that generate the error use continues statement and than again take start from next to skipping area. Example: An “0” divisor generate the error, so we skipped these area from loop and take start with properly.