PHP 101+1:function & form

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PHP 101+1:function & form Fundamental PHP & Web Development lecturer : Lucien Lee 李柏緯 Lecture 3

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? What is function 2

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function 3 give input and send back output

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4 function IN out

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5 feature function IN out

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function 6 function Name([arguments]){ statements; return output; }

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function example function discount($price){ $price *= 0.8; return $price; } 7

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use function $item1 = 1000; echo discount($item1); ---Another place--- $item2 = 800; echo discount($item2); 8

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variable scope 9 Does the variable still alive?

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Scope 10 $Julia $global function A $Liz function B $global $Julia $global $Liz $global

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Scope $A = “hello”; echo $A; //”hello” function inner(){ $A = “world”; echo $A; //”world” } 11

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some function 12 introduce some php function

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isset() Determine if a variable is set and is NULL. 13

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empty() Determine whether a variable is empty 14

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time() number of seconds since the Unix Epoch 15

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date($format) return date info with format 16

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rand([min,max]) get random value 17

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array_search(value,array) find value exist in array or not 18

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! form: basic way pass info to back 19

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form 20 from wikipedia

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form input element 21

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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.

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Text Fields 23 from w3schools

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Password Field 24 from w3schools

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Radio Buttons 25 from w3schools

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Checkboxes 26 from w3schools

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textarea At w3schools.com you will learn how to make a website. We offer free tutorials in all web development technologies. 27 from w3schools

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select Volvo Saab Mercedes Audi 28 from w3schools

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Button Click Me! 29

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Submit Button 30

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? GET & POST 31

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HTTP method 32 request and tell server what to do

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GET •Retrieve data •remain in the browser history •never be used when dealing with sensitive data •have length restrictions 33

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POST •query sent in HTTP message body •do not remain in the browser history •no restrictions on data length •(as create in RESTful) 34

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35 GET POST

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more method •HEAD •PUT •DELETE •TRACE •CONNECT •...... 36

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? How to retrieve message in server 37

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IN SERVER 38 •$_GET[‘name’] •$_POST[‘name’]

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Live Coding 39

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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.

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Test Data 41

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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.

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Test Data 43