PHP 101+1:function & form

Fundamental PHP & Web Development

Transcript

1. PHP 101+1:function & form Fundamental PHP & Web Development lecturer : Lucien Lee 李柏緯 Lecture 3
2. ? What is function 2
3. function 3 give input and send back output
4. 4 function IN out
5. 5 feature function IN out
6. function 6 function Name([arguments]){ statements; return output; }
7. function example function discount($price){ $price *= 0.8; return $price; } 7
8. use function $item1 = 1000; echo discount($item1); ---Another place--- $item2 = 800; echo discount($item2); 8
9. variable scope 9 Does the variable still alive?
10. Scope 10 $Julia $global function A $Liz function B $global $Julia $global $Liz $global
11. Scope $A = “hello”; echo $A; //”hello” function inner(){ $A = “world”; echo $A; //”world” } 11
12. some function 12 introduce some php function
13. isset() Determine if a variable is set and is NULL. 13
14. empty() Determine whether a variable is empty 14
15. time() number of seconds since the Unix Epoch 15
16. date($format) return date info with format 16
17. rand([min,max]) get random value 17
18. array_search(value,array) find value exist in array or not 18
19. ! form: basic way pass info to back 19
20. form 20 from wikipedia
21. form <form action=”URL” method=”{post, get}” name=”example”> input element </form> 21
22. from 22 •action: Specifies where to send the form-data when a form is submitted. •method: Specifies the HTTP method to use when sending form-data. •name:Specifies the name of a form.
23. Text Fields <input type="text" name="firstname"> 23 from w3schools
24. Password Field <input type="password" name="pwd"> 24 from w3schools
25. Radio Buttons <input type="radio" name="sex" value="male"> <input type="radio" name="sex" value="female"> 25 from w3schools
26. Checkboxes <input type="checkbox" name="vehicle" value="Bike"> <input type="checkbox" name="vehicle" value="Car"> 26 from w3schools
27. textarea <textarea rows="4" cols="50"> At w3schools.com you will learn how to make a website. We offer free tutorials in all web development technologies. </textarea> 27 from w3schools
28. select <select> <option value="volvo">Volvo</option> <option value="saab">Saab</option> <option value="mercedes">Mercedes</option> <option value="audi">Audi</option> </select> 28 from w3schools
29. Button <button type="button">Click Me!</button> 29
30. Submit Button <input type="submit" value="Submit"> 30
31. ? GET & POST 31
32. HTTP method 32 request and tell server what to do
33. GET •Retrieve data •remain in the browser history •never be used when dealing with sensitive data •have length restrictions 33
34. POST •query sent in HTTP message body •do not remain in the browser history •no restrictions on data length •(as create in RESTful) 34
35. 35 GET POST
36. more method •HEAD •PUT •DELETE •TRACE •CONNECT •...... 36
37. ? How to retrieve message in server 37
38. IN SERVER 38 •$_GET[‘name’] •$_POST[‘name’]
39. Live Coding 39
40. HomeWork 40 • make a drink order form and when user confirm, calculate the total money. • if amount of drinks is greater than 10, all drinks have 10% discount. • ceiling the final price.
41. Test Data 41
42. HomeWork Advanced 42 • make a drink order form and when user confirm, calculate the total money. • ordering black tea and green tea together has 20% discount. • expect drinks with above-mentioned discount, if amount of drinks is greater than 10, these drinks have 10% discount.
43. Test Data 43