![Arrays
• Can be used to represent a data source [database, file,
etc.]
• There are many built in functions for arrays.
http://php.net/manual/en/function.array.php
• array_sum($amounts); //R24.23;
• Database queries can be returned as arrays](https://image.slidesharecdn.com/devtraning2016-basicsofphp-160318053227/85/Dev-traning-2016-basics-of-PHP-16-320.jpg)
![Simple Objects – Object Oriented Programing
• Classes
• Can be instantiated
• Has instance variables
• getters
• Setters [mutators]
• Can be extended
• Accessibility
• - public / private / protected](https://image.slidesharecdn.com/devtraning2016-basicsofphp-160318053227/85/Dev-traning-2016-basics-of-PHP-22-320.jpg)
Dev traning 2016 basics of PHP
- 1. Basics of PHP SACHEEN DHANJIE
- 2. Sacheen Dhanjie Senior Developer @ Afrihost.com
- 3. What is PHP? • Hypertext PreProcessor • Built on C • Made for the web, but can run on the command line • We run all our processing scripts via the CLI
- 4. Variables • The $ is used to prefix a string, which denotes a variable • $name = “BOB”; //this assigns the variable • $sentence = “my name is $name”; // what will this out put? • $concatenate = “my name is ”.$name; //what will this output? • Display information • echo $sentence; • print($sentence);
- 5. Naming Variables • $name; // lower case for single words • $lastName; //camel case for more than one word • $animalsArray = (‘cow’,’dog’); // not good • $animals = (‘cow’,’dog’); • $userObj = new User() // not good • $user = new User(); • http://www.php-fig.org/psr/
- 6. Numbers • echo 2 + 2; ? • echo '2' + 2; ? • ;echo '2' + "2"; ? • echo 2 + 'c’; ?
- 7. Numbers • Everything in PHP is cast to an integer by default • echo 2 + 2; //4 • echo '2' + 2; //4 • ;echo '2' + "2"; //4 • echo 2 + 'c’; //2
- 8. Casting • What is casting? • Casting means making a value a particular type • $i = 2.332242; • (int) $i; //2 • (float) $i; // 2.332242 • (string) $i; // 2.332242
- 9. Casting • Why do we care about casting? • When we interact with data, the language you work with may assume things • If you parse and XML message - https://en.wikipedia.org/wiki/XML • <amount>10.32</amount> • Using an XML parser, the 10.32 will be assumed as an integer, 10 and not 10.32 • Casting the value will give you the 10.32 • These things are picked up as you learn to code
- 10. Operations • < //less than • > //greater than • <= //less than or equal to • >= //greater than or equal to • = //assignment $i =1; • == //equality (1 == true) • === //type equlity (1 === true) • ! //negation - you should be carful (!$bob instanceof Class) rather (!($bob instanceof Class))
- 11. What if $bob? Bob Ross or just Ross?
- 12. What if $bob • (!$bob) • If $bob was null; //true • If $bob was 1; //false • If $bob was false; //true • If $bob was 0; //true
- 13. Conditions
- 14. Conditions
- 15. Arrays
- 16. Arrays • Can be used to represent a data source [database, file, etc.] • There are many built in functions for arrays. http://php.net/manual/en/function.array.php • array_sum($amounts); //R24.23; • Database queries can be returned as arrays
- 17. I hate else
- 18. Limit Nesting Any suggestions to neaten this up?
- 19. Limit Nesting
- 20. Nesting • Keep your nesting to a minimal • The deeper you nest the more complex you code becomes • The more it is to debug • Refactor if your code becomes a mess. • Make smaller functions for each complex bit. • Avoid else • Return early is not a bad thing
- 21. Do one thing and do it well
- 22. Simple Objects – Object Oriented Programing • Classes • Can be instantiated • Has instance variables • getters • Setters [mutators] • Can be extended • Accessibility • - public / private / protected
- 23. User Class
- 24. Using the User Class
- 25. Extend the User Class
- 26. Using the Reseller Class
- 27. Cool Functions
- 28. Something Cool