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Introducere in php
Un fisier php poate contine text, etichete html si scripturi. Scripturile in fisierele php sunt executate de server.
What is PHP?
• PHP stands for PHP: Hypertext Preprocessor
• PHP is a server-side scripting language, like ASP
• PHP scripts are executed on the server
• PHP supports many databases (MySQL, Informix, Oracle, Sybase, Solid, PostgreSQL, Generic ODBC, etc.)
• PHP is an open source software (OSS)
• PHP is free to download and use
What is a PHP File?
• PHP files may contain text, HTML tags and scripts
• PHP files are returned to the browser as plain HTML
• PHP files have a file extension of ".php", ".php3", or ".phtml"
What is MySQL?
• MySQL is a database server
• MySQL is ideal for both small and large applications
• MySQL supports standard SQL
• MySQL compiles on a number of platforms
• MySQL is free to download and use
PHP + MySQL
• PHP combined with MySQL are cross-platform (means that you can develop in Windows and serve on a Unix platform)
Why PHP?
• PHP runs on different platforms (Windows, Linux, Unix, etc.)
• PHP is compatible with almost all servers used today (Apache, IIS, etc.)
• PHP is FREE to download from the official PHP resource: www.php.net
• PHP is easy to learn and runs efficiently on the server side
Where to Start?
• Install an Apache server on a Windows or Linux machine
• Install PHP on a Windows or Linux machine
• Install MySQL on a Windows or Linux machine
http://www.php.net/manual/en/install.php cum sa instalezi php
http://www.php.net/downloads.php
http://www.mysql.com/downloads/index.html
http://httpd.apache.org/download.cgi
Nu veti putea vizualiza codul sursa php selectand view source in browser deoarece scripul este executat de catre server iar rezultatul este trimis in browser.
Basic PHP Syntax
Un PHP script incepe cu <?php si sfarseste cu ?>. acesta poate fi plasat oriunde in document.
<?php
?>
Un fisier PHP contine etichete HTML , la fel ca un fisier html.
Un simplu script PHP ce trimite textul "Hello World" browserului:
<html>
<body>
<?php
echo "Hello World";
?>
</body>
</html>
Fiecare linie de cod este scrisa pe o coloana.
There are two basic statements to output text with PHP: echo and print. In the example above we have used the echo statement to output the text "Hello World".
Comments in PHP
In PHP, we use // to make a single-line comment or /* and */ to make a large comment block.
<html>
<body>
<?php
//This is a comment
/*
This is
a comment
block
*/
?>
</body>
</html>
Variables are used for storing values, such as numbers, strings or function results, so that they can be used many times in a script.
Variables in PHP
Variables are used for storing a values, like text strings, numbers or arrays.
When a variable is set it can be used over and over again in your script
All variables in PHP start with a $ sign symbol.
The correct way of setting a variable in PHP:
$var_name = value;
New PHP programmers often forget the $ sign at the beginning of the variable. In that case it will not work.
Let's try creating a variable with a string, and a variable with a number:
<?php
$txt = "Hello World!";
$number = 16;
?>
PHP is a Loosely Typed Language
In PHP a variable does not need to be declared before being set.
In the example above, you see that you do not have to tell PHP which data type the variable is.
PHP automatically converts the variable to the correct data type, depending on how they are set.
In a strongly typed programming language, you have to declare (define) the type and name of the variable before using it.
In PHP the variable is declared automatically when you use it.
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