Showing posts with label meeting. Show all posts
Showing posts with label meeting. Show all posts

Wednesday, June 22, 2016

Introduction 2 Web Programming Languages Meeting 1

05:00  , , , , , , ,  


Basically, there are two types of web programming languages, that is, client side languages and server side languages. Those which belong to client side languages are HTML, JavaScript, VBScript, Java Applet, and some others. And the server side ones are PHP, JSP, ASP, Servlet, .Net and some others.

The basic difference between the two is where the scripts are executed. Client side languages are executed in client side meaning in the users’s browser while server side ones are executed in servers.

Another insignificant difference is that we can simply see the client side scripts by right-clicking mouse while the server side ones can’t.

Well, from now on we will learn one of those server side languages, PHP. The question is why we choose server side langages and why PHP?

Some reasons why I prefer to choose server side language is that they are more secure as users can’t see the codes, they can connect to database and manage the data so that we can make interactive web sites with our users, and some more.

And why PHP? It s because PHP now is known as the most popular language to develop a web site. It offers many benefits to either programmers and users. PHP is easily learned, very fast, robust, and many more, you can find why PHP becomes the most users all over the world from many forums, blogs and web sites. So, no more talks about PHP and we can go on coding for the next lesson…

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Monday, June 20, 2016

If Else Meeting 7

07:33  , , , ,  

As a further lesson of "if" condition, now we learn on "if ... else " contion. In this lesson there are two choices and only one is fired. If the condition is "true" then the first statement is fired and if "false" the second statement is fired.
This is similar to the previous lesson but different. Pay attention and see the difference from the previous.

<html>
<head>
<title>Conditions - cont</title>
</head>
<body>
<h3>Thank you for entering your data</h3><br>
<h4>The marks result is:</h4>
<?php
$usrname = $_POST[usrname];
$mark = $_POST[mark];
if ($mark >= 60){
print("<h3> $usrname is <font color=blue><b>"Passed"</b></font>
</h3>");
}
else {
print("<h3>
$usrname is <font color=red><b>"Not Passed"</b></font>
</h3>");
}
?>
</body>
</html>

save it as seven.php (this might overwrite the previous file unless you renamed it before save this file) and we still use six.php (in the previous lesson) file to call the form so that we can save time bu not recoding the first/origin file.

The login is, if condition is "true" then the statement in the first { } bracket is executed, if "false" the statement in the second { } bracket is executed.

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Sunday, June 19, 2016

Catching Parameters Meeting 5

11:21  , , , ,  

In this lesson, we are learning on catching parameters from another page. So we will have 2 files as examples, the first is containing a form in which will be submitted to another page. The second is the file which will catch the first page/file.

Here is the first script:

<html><head><title>Fourth</title></head>
<body>
<center><h3>Registration</h3></center>
<hr>
Please fill your username and password in this registration form below
<form action="five.php" method="post">
<pre>
Nama : <input type="text" name="usrname" size="30" maxlength="30"><br><br>
Password : <input type="password" name="passwd" size="8" maxlength="8"><br><br>
<input type="submit" value="Send Soon!">
</pre>
</form>
</body></html>

In the script above we only apply html codes as we ignore some security aspects for this basic lesson. The most important thing is the parameter action="name.php" method="post" inside form tag, name="usrname" and name="passwd" because those parameters will be catchedby the next file/page.
Save the file as four.php


Next, here is the second script:

<html><head><title>Fifth</title></head>
<body>
<center><h3>Form Destination</h3></center>
<hr>
<h4>Thank you for submitting your registration form</h4>
We have completely received your registration form
<?php
$username = $_POST[usrname];
$passwd = $_POST[passwd];
print("Your username is <b>$usrname</b><br>");
print("Your password is <i>$passwd</i><br>");
?>
</body></html>


The file above must be saved as five.php. Why? It s because a page/file where the first file was addressed (see action="five.php" in the previous script). Then we catch the other two parameters with a command $_POST[...]. We are using "POST" because in the first file we used POST method. Basically we may use POST or GET method.

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Friday, June 17, 2016

First Script Meeting 2

13:54  , , , ,  

Before we start coding PHP, it s better to know the software environment needed to work with our scripts.
They are:
PHP, to interpret our PHP scripts.
Web server, to serve request and respond from and to users. There are many webs ervers which can serve with php scripts and one of the most popular is apache.
MySql, this is a database which is commonly paired to PHP and mostly used by php developers.

Those 3 is commonly distributed as one bundle (3 in 1). We can find it in the internet or from google with key words xampp, appserv, etc. By installing one of those bundles we will have php, apache, and mysql with a simple little setup.
One more, what we need to code is an editor. Basically we can write on any editor like notepad, wordpad, etc. Of course there are many editors which is spesifically for php and we can easily find it in the internet or by googling.
So we will not discuss about it anymore because I am going to focus in php scripts tutorial.
Well, it s time to code php now and pay attention to the script below:

<?php
print("Hello World!");
printf("<br>Today is %s ", Date("d F Y"));
$nama = "Every body"; //creating a variable must be started with $
print("<br><br>Good morning $nama, have a nice day!");
/*
this is for multilines comments
*/
printf("<hr><br>Good afternoon %s, see you tomorrow morning",$nama);
?>


save it as one.php in folder for example: C:AppServwwwphpisus asicone.php
Because i used bundle from Appserv, all files should be saved under folder www if you are using another bundle probably it is under folder htdocs. Please read for each bundle carefully.
Going back to the scripts. After saving it, open your browser and point to http://localhost/phpisus/basic/one.php yous should see:


Well, it is the first script. The most principal thing of PHP code is that any PHP code must be between <?php and ?> bracket and each line of PHP commands must be ended with a semicolon (;).

For the PHP commands used above please refer to the result to analyze the commands functions in PHP.

Any question can be posted as comments and so do the answers. See you in the next meeting.

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Sunday, June 12, 2016

Looping for Meeting 10

02:36  , , , ,  

Basically "PHP" has 3 kinds of loop, namely, "for" statement, "while" statement, and "do ... while" statement. Below we learn on "for" statement.

The regular expression of "for" statement is like this:
for (initialization; condition(s) or bound(s); increment or decrement) {
// code to be executed
}

The expressions within the parentheses of the "for" statement are separated by semicolons. Usually, the first expression initializes an $i (as a counter) variable, the second expression is the test condition for the loop, and the third expression increments or decrements the counter depending on the condition given. Below we go directly to the example:

<?php
for ($i=1; $i<=10; $i++) {
echo "$i * 10 = ".($i * 10)."<br />";
}
?>

save it as loopfor1.php and open via your browser. The result should be like this:

1 * 10 = 10
2 * 10 = 20
3 * 10 = 30
4 * 10 = 40
5 * 10 = 50
6 * 10 = 60
7 * 10 = 70
8 * 10 = 80
9 * 10 = 90
10 * 10 = 100

One thing to watch in "for" statement is that "dont forget to write the condition(s) expression" to stop looping so that the program will not loop infinitely.

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Thursday, June 9, 2016

If elseif Meeting 8

19:03  , , , ,  

We still learn more on "if" condition. In this lesson we learn on multiple conditions "if ... elseif" . We have more than two choices but still only one is fired. The script will inspect, find and execute only the "true" condition.
We still use six.php (in meeting 6 as the first file to call) to be opened from your browser, and save this script below as seven.php (rename first the previous seven.php to another filename):

<html>
<head>
<title>Conditions - cont</title>
</head>
<body>
<h3>Thank you for entering your data</h3><br>
<h4>The marks result is:</h4>

<?php
$usrname = $_POST[usrname];
$mark = $_POST[mark];
if (($mark<=100)&& ($mark>90)){
print("<h3>
$usrname got <font color=#000000><b>"A"</b></font>
</h3>");
}
elseif (($mark<=90)&& ($mark>75)){
print("<h3>
$usrname got <font color=#0000ff><b>"B"</b></font>
</h3>");
}
elseif (($mark<=75)&& ($mark>60)){
print("<h3>
$usrname got <font color=#bb0000><b>"C"</b></font>
</h3>");
}
elseif (($mark<=60)&& ($mark>40)){
print("<h3>
$usrname got <font color=#ff0000><b>"D"</b></font>
</h3>");
}
elseif (($mark<=40)&& ($mark>=0)){
print("<h3>
$usrname was <font color=#ff0000>
<b><u>"Failed"</u></b></font>
</h3>");
}
else {
print("<h3>
<font color=##ff0000><b>"Invalid Data"</b></font>
</h3>");
}
?>
</body>
</html>

in the file above we also apply a little bit more complicated conditions with the hope that we can make a good progress on conditions. Try to call six.php from your browser and try some various inputs to submit and see the results.

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Tuesday, May 31, 2016

If Condition Meeting 6

22:57  , , , ,  

Now we learn on "IF Ststement/Condition". In this example we still apply 2 files (pages) so that we can remember the previous lesson. Please pay attention to the single "if condition" below:

<html>
<head>
<title>Conditions</title>
</head>
<body>
<h3>IF Condition</h3>
<br>
Fill in a name and a exams mark[0-100] below:
<form action="seven.php" method="post">
<pre>
Nama : <input type="text" name="usrname" size="30" maxlength="30"><br><br>
Nilai : <input type="text" name="mark" size="3" maxlength="3"><br><br>
<input type="submit" value="Send Soon!">
</pre>
</form>
</body>
</html>

save the above file as six.php
Then create a script as a new file and save it as seven.php like below:

<html>
<head>
<title>Seven</title>
</head>
<body>
<h3>Thank you for entering your data</h3><br>
<h4>The marks result is:</h4>
<br>
<?php
$usrname = $_POST[usrname];
$mark = $_POST[mark];
$result = "Not Passed";
if ($mark >= 60){
$result = "Passed";
}
print("<h3>
$usrname is <font color=red><b>$result</b></font>
</h3>");

?>
</body>
</html>

Then open your browser and point to the six.php and see the result. It should show that the mark greater than or equal to 60 is "passed", if not it s "not passed".
The logic is, if the condition is "true" then the statement inside the { } bracket is executed if "false" it is not executed.

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Saturday, May 28, 2016

Switch Statement Meeting 9

04:03  , , , ,  

"switch" statement is the alternative way to the multiple "if..elseif" conditions and can be shorter way to code than "if..elseif". The regular scripts applying "switch" staement is like this:

switch (expression) {
case result1:
// execute this if expression results in result1
break;
case result2:
// execute this if expression results in result2
break;
default:
// execute this if no break statement has been encountered hitherto
}

a switch statement will inspect expression by expression in a list of expression, and fire only one statement which is a match.

It is important to include a break statement at the end of any code that will be executed as part of a case statement. Without a break statement, the program flow will continue to the next case statement and ultimately to the default statement. In most cases, this will result in unexpected behavior, likely incorrect!

try a script below and save it as eight.php

<?php
$greeting = "morning"; //you may change to "afternoon" or "evening"
switch ($greeting) {
case "morning":
echo "Good morning";
break;
case "afternoon":
echo "Good afternoon";
break;
case "evening":
echo "Good evening";
break;
default:
echo "I dont know what to say but good $mood anyway.";
break;
}
?>

we initialize a variable $greeting with a value "morning". "switch" will evaluate each "case" and if find a match, it will be executed. In this case the result is "Good morning". Yet if we change the value of the variable $greeting to "afternoon" or "evening" the result will change accordingly.

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Thursday, May 19, 2016

Variable and Constant Meeting 3

18:03  , , , , ,  

Now, we are learning on variables and constants in PHP. TPlease pay attention to the scripts below:

<h3>Variables & Constant</h3>
<hr><h4>Employees Data</h4>
<?php
$id = 19200; $name = "Mr. Bean"; $address = "Jl. Godean Gg. II/4";
define("city", "Yogyakarta");
print("ID : $ID<br>");
print("Employees Name : $name<br>");
print("Address : $address<br>");
printf("City : %s<br>",city);
?>
<br><br><hr>
<h4>Calculating A Circle</h4>
<?php
$rad = 10; define("phi",3.14);
printf("Circle radiant : %s cm<br>",$rad);
printf("Area of a aircle : %s cm<sup>2</sup><br>",($rad*$rad*phi));
printf("Circumference of a circle : %s cm<br>", (2*phi*$rad));
?>

As before, save it as two.php and then open the file via browser. And the result should be like this:


For variables we know from the previous lesson that it must be started with $. But for constant we need to use a function "define" with 2 parameters as you can see above. The first parameter is the name of the constant and the second is the value of the constant.

Please pay attention to each line of commands and refer to the result so that you can analyse what a function is for.

As usual, any questions can be addressed via comments and so do the answers. See you in the next lessons.

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Saturday, May 14, 2016

Data type conversion Meeting 4

11:48  , , , , ,  

Now, we are going to learn on data types conversion in PHP. Though in PHP we may undeclare the data-type, but we sometimes need to convert the data-type to get the exact results and avoid misleading results. Below is a script which show 3 kinds of how to convert a data-type in PHP. Please read carefully and uncomment one by one of each method of conversions to understand the functions.

<h3>Data type conversion</h3>
<hr><h4>Calculating A Circle</h4>
<?php
$rad = "10.5 cm";
define("phi",3.14);
//php has 3 ways on converting data types. to try it one by one you can uncomment each command below
/*settype($rad,"integer");*/ /*$rad = intval($rad);*/ /*$rad=(integer)$rad;*/
/*settype($rad,"double");*/ /*$rad = doubleval($rad);*/ /*$rad=(double)$rad;*/
/*settype($rad,"string);*/ /*$rad = strval($rad);*/ /*$rad=(string)$rad;*/
printf("Circle radius : %s <br>",$rad);
printf("Circles area : %s cm<sup>2</sup><br>",($rad*$rad*phi));
printf("Circles circumference : %s cm<br>", (2*phi*$rad));
?>

The result should be like this:


as usual, any questions can be posted via comments and so do the answers. If needed iI will create a new label providing "questions and answers". See you next meeting.

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