Html and Php

Html and Php

html and php CS4604 B. Aditya Prakash Qianzhou Du Introduc?on to html • Basic page: <html> <tle> …… </?tle> <body> …… <a> …… </a> …… <body> </html> • How to create a table in html? <table> <tr><td>Tom</td><td>Jerry</td></tr> <tr><td>Book</td><td>Paper</td></tr> …… </table> • <table></table> creates a table. • <tr></tr> creates a row in a table. • <td></td> creates a grid in a row. • Run the above code and get: • Create a hyperlink: <a href=“index.php??tle=‘index’” ?tle = “index”> index </a> • When you click this hyperlink, you will go to “index.php”, and send ?tle = ‘index’ to the new website. • And you will send ?tle =‘index’ to “index.php” • Create a form : <form ac?on=“form_ac?on.php” method = “get”> <input type=“text” name=“Search”> <input type=“submit” name =“Search” value = “Search”> </form> • “ac?on” means that it will send this form’s data to “form_ac?on.php”, when you submit this form. • “method” means how to send this form’s data. • There are some types you can choose. • For more informaon, please go to hYp://www.w3schools.com/html/ Introduc?on to PHP • Basic php <?php Echo “hello world!”; ?> • Use “$” to define a variable. $s = “hello world”; • Assign by reference $a = &$b • Variable types: String $s=“database”; Integer $i=1; Double $d=6.66; Boolean $b=false Array $arr[0] = 1; $arr[1] = 2; …… Object • Understand scoping rules, variable scope: global vs. stac. • References: are not pointers • Classes: PHP5 has a completely new mechanism for handling objects; $this is the invocant; one base class only PHP • Embed php into html: <html> <body><?php echo “hello world!”; ?></body> </html> echo is a print func?on. • Also we can embed html into php: <html> <body><?php echo ‘ <b>hello world!</b> ’; ?></body> </html> • if … else … if(expression) {statement1;} else { statement2; … } • While while(expression) {statement; …} • do … while … do {statement; …} while(expression) • for for(expression1; expression2; expression) {statement; …} • “POST” and “GET” methods: First please recall the “form” in html: <form ac?on=“form_ac?on.php” method = “get”> <input type=“text” name=“Search”> …… In “form_ac?on.php”, you can use GET method to get the value of “Search”. $temp = $_GET[‘Search’]; Also you can use the POST method in the same way: $temp = $_POST[‘name’]; • Connect to postgresql: pg_connect(“host=? port=? dbname=? user=? Password=?”); • Run query: $query=“select … from … where …”; $queryresult = pg_query($query); • Make sure you do error/excep?on handling • E.g. what happens if the query fails? • More postgresql funcons in PHP: pg_fetch_array Fetch a row as an array. pg_free_result($queryresult); Free result memory. pg_close($dbconn); Close a postgresql connecon. You can check the following link to get more func?ons: hYp://us2.php.net/manual/en/ref.pgsql.php Instruc?ons (if you want to use the cs4604 server) • Create a directory called cs4604 in your home directory. Make it world readable (chmod a+r cs4604). • You can access the directory from hYp://cs4604.cs.vt.edu/~<login> • Each project should choose a member whose directory will contain the web interface for that project. .

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