NMD202 Web Scripting

Week7

What we will cover today

Student List Exercise String manipulation Exercises MVC Patterns Exercises Assignment 1

Student List Exercise

Check the implementation at:

http://learnline.cdu.edu.au/units/webscripting/classmaterials/source/student/listStudents.php

String Manipulation

PHP has several functions to manipulate strings:

http://au.php.net/manual/en/ref.strings.php

String Manipulation

strlen ($string) - Length String

strtolower($string) – Convert string to lower case

strtoupper($string) – Convert string to upper case

trim($string) - Strip whitespace from the beginning and end of a string

String Manipulation

Find strings within strings:

strpos ($haystack , $needle);

This will give you the index of the searched substring.

Use stripos for case insensitive search

String Manipulation

Get a substring from string

substr ($string , $start, $length )

Returns the portion of $string specified by the $start and $length parameters.

String Manipulation

Split a string into segments

Explode($delimiter , $string);

Returns an array of strings, each of which is a substring of $string formed by splitting it on boundaries formed by the string $delimiter .

String Manipulation

Join a string from segments

implode($glue, $pieces);

Returns a string containing a string representation of all the array elements ($pieces) in the same order, with $glue between each element

String Manipulation

String replace:

str_replace($search ,$replace , $subject);

This function returns a string or an array (depending on $subject) with the replaced values.

String Manipulation

String Hashing:

md5($string)

crypt($string)

sha($string)

String Manipulation

Regular Expressions:

ereg_replace — Replace regular expression

ereg — Regular expression matcheregi_replace — Replace regular expression case insensitive

eregi — Case insensitive regular expression match

Exercises

Write some code to make sure that student names have their first letter in uppercase when inserted in the database:

ie: input:luis silva Stored: Luis Silva

MVC Pattern

MVC Pattern

Implementation in php:

Controller is called with parameters (post or get).

Controller routes the request according to some parameters (task) and calls the model to collect, perform changes on the data

View is built with data collected from the model and rendered to the user

MVC Pattern

View:

<form method=“post” action=“controller.php”>

<input type=“hidden” name=“task” value=“insert”>

MVC Pattern

Controller:$task = (isset($_POST[‘task’]))? $_POST[‘task’]:$_GET[‘task’];

switch ($task)

{

case “insert”:

doInsert();

case “update”:

doUpdate();

case “addNew”:

renderAddForm();

default:

renderList ();

}

MVC Pattern

Controller:

function doInsert();

{

insertStudent($_POST[‘name’], $_POST[‘email’]);

renderList ();

}

MVC Pattern

Controller:

function renderList ();

{

$students = getStudentsList();

require_once(‘studentList.php’);

}

MVC Pattern

view:<table>

<?php

While ($student = mysql_fetch_array($students))

{

echo ...

Exercises

Redo the student list exercise implementing it as an MVC pattern