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4הרצאה
אינטרנט דף של דינמיעיבוד
.Murach’s PHP and MySQL by Joel Murach and Ray Harrisמתוך
Web Server
PHPScript
Database Server
HTTP request
HTTP response`
Web Browser
" על קוד הרצת י עפ משתנה דינמי אינטרנט דףעדכון, בכל להשתנות יכול השרת
דינמי אינטרנט דף של העיבוד תהליך
• The web browser builds an HTTP request, and sends it to the relevant web server.
• If the user submitted data, it will be included in the request.
• The web server checks the file extension of the requested page. If it is PHP it invokes the PHP interpreter which is running on the web server.
• The PHP interpreter finds the relevant PHP script from the hard drive, along with any data it needs, and executes the script (it may request data from the database).
• The script generates an HTML page as output, and sends it to the client as an HTTP response.
• The response includes the HTML formatting for the page.
• The web browser (client) receives the HTTP response, and uses the HTML to format and display the page in the web browser.
• The browser does not know if the page was obtained from a static HTML page or generated using PHP.
PHP
PHP: Hypertext Preprocessor What is a PHP File?
PHP files can contain text, HTML, CSS, JavaScript, and PHP code
PHP code are executed on the server, and the result is returned to the browser as plain HTML
PHP files have extension ".php" Example:<?phpecho "My first PHP script!";?>
Installed as part of WAMP
What Can PHP Do?
Generate dynamic page content Create, open, read, write, delete, and
close files on the server Collect form data Add, delete, modify data in your
database Can be used to control user-access PHP can encrypt data Send and receive cookies
PHP Syntax
A PHP script can be placed anywhere in the document. A PHP script starts with <?php and ends with ?>: The default file extension for PHP files is ".php". A PHP file normally contains HTML tags, and some PHP
scripting code. In PHP, all keywords (e.g. if, else, while, echo, etc.),
classes, functions, and user-defined functions are NOT case-sensitive.
However; all variable names are case-sensitive. In PHP, a variable starts with the $ sign, followed by the
name of the variable. http://www.w3schools.com/php/default.asp
Output to HTML: Echo / print
Echos what is in ” ” to the html. Any html can be input…
Examples echo ”hi”; echo ”<br>”; echo”<h1>blabla</h1>”; echo “<script>alert(‘careful’)</script>;
There is also a print function: print "Hello world!<br>";
Data Types
Variables can store data of different types, they are not declared.
Strings (in single or double quotes)<?php $x = "Hello world!";$y = 'Hello world!';
?>
Integers$x = 5985;
For other types: http://www.w3schools.com/php/php_datatypes.asp
Conditional Statements
http://www.w3schools.com/php/php_if_else.asp
http://www.w3schools.com/php/php_switch.asp
http://www.w3schools.com/php/php_looping.asp
http://www.w3schools.com/php/php_looping_for.asp
Functions
Aside from built in functions, we can write our own:
<?phpfunction sum($x, $y) { $z = $x + $y; return $z;}
echo "5 + 10 = " . sum(5, 10) . "<br>";echo "7 + 13 = " . sum(7, 13) . "<br>";echo "2 + 4 = " . sum(2, 4);?>
Arrays
Indexed array:<?php$cars = array("Volvo", "BMW", "Toyota");$arrlength = count($cars);for($x = 0; $x < $arrlength; $x++) { echo $cars[$x]; echo "<br>";}?>
Associative array (use named keys that you assign to them):
<?php$age = array("Peter"=>"35", "Ben"=>"37", "Joe"=>"43");echo "Peter is " . $age['Peter'] . " years old.";?>
SuperGlobals
Several predefined variables in PHP are "superglobals“ They are always accessible, regardless of scope You can access them from any function, class or file without
having to do anything special. The PHP superglobal variables are:
$GLOBALS $_SERVER $_REQUEST $_POST $_GET $_FILES $_ENV $_COOKIE $_SESSION
$_GET
PHP superglobal $_GET is used to collect form data. $_POST is also a superglobal used to collect form data
We will learn it later
The file welcome.php:
Form Validation
http://www.w3schools.com/php/php_form_validation.asp
Self reading…
Working With DB
With PHP, you can connect to and manipulate databases.
Some examples will be given in class document
Others can be found here http://
www.w3schools.com/php/php_mysql_intro.asp
And other places…