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- 1. COP 3813 Introto Internet Computing Prof. Roy Levow PHP
- 2. PHP P HP: H ypertext P rocessor Server-side scripting Script embedded in html Script runs on server Allows secure access to resources on server – database, file, etc. Hides program code from users But, more network traffic Standard extension is .php
- 3. Basic Format <html> … <body> <?php echo "Hello World"; ?> </body> </html>
- 4. PHP File FormScript is embedded in HTML Bounded by <?php and ?> Output replaces script code in page sent to client
- 5. PHP Service Mustbe installed on server Enabled in web server Versions for Apache and IIS No many platforms Primary site for PHP www.php.net
- 6. Free PHP ServicesA number of sites offer limited free PHP services The following site lists several http://www.0php.com/free_PHP_hosting.php
- 7. Your PHP WorkYou need a place to work with PHP You may do any of the following provided that the hosting site is publicly accessible Set up PHP on your own server Subscribe to a free hosting site Use any other hosting site
- 8. Language Resources OnlinePHP Manual http://www.php.net/manual/en/ Tutorials http ://www.php.net/links.php#tutorials http://www.w3schools.com Google for many others
- 9. Variables Names beginwith $ followed by string of letters and digits Case sensitive No declarations Type determined by value $num = 5; $myName = “Prof. Levow”
- 10. Named Constants define(“ONE”,1); do not have $ must be scalars
- 11. Types int, integerfload, double string //enclosed in ‘ or “ bool, Boolean //true or false array //actually a map object // for O-O programming NULL //no value
- 12. Constants Typical rulesfor numbers and strings Usual \ escapes in strings settype($var, “type”) function to change type of a value actually changes type of stored value (type) expr typical “C” cast of value Example: Fig. 26.3, data.php
- 13. Operators Comparable toC operators Usual operators arithmetic comparison logical increment and decrement op=
- 14. String Operators . for concatenation variable interpolation with “ “ embedded variable reference is replaced by value example: “My name is $name.” numeric valued strings converted for arithmetic 7 + “3” yields 10
- 15. Regular Expressions Patternmatching in strings ereg, eregi (reg_exp, $search, $match) Meta characters: * + ? ^ $ . Character class [list] a-z :alpha:, :alnum:, :digit:, :space:, :lower:, :upper: Repetition: {n}, {m,n}, {,n}
- 16. Environment Server andClient Side $_SERVER $_ENV $_GET $_POST $_COOKIE $GLOBALS
- 17. Form Processing Examples: fig 26.13 form.html fig 26.14 form.php Login Example: fig 26.15 password.html fig 26.16 password.php
- 18. PHP Examples Cookiesfig 26.20 cookies.html fig 26.21 readCookie.php PHP and Database connectivity