Image creating and manipulating in PHP can be done with multiple libraries, some officially supported by PHP and some made by third parties. A common library, especially for developers new to image libraries, is the GD package. You must include the library you wish to use upon installation of PHP (if it is officially supported), or manually include the library into your scripts.
I have had a lot of experience with image modification modules with PHP. In order to perform image manipulation in PHP you need an image processing module installed such as GD2 or imagemagik. GD2 comes with PHP and can be installed fairly easily if it is not already installed. You can follow the PHP GD manually for the usage of these functions.
You can use the GD extension for PHP to edit image files.
PHP can create images of different sizes. It depends on a particular image.
First install a webserver such as apache.Then download and unpack the PHP source for Unix/Linux.Open apache's httpd.conf and enable the PHP5 module and specify the location of PHP. There should be sample lines to uncomment within this file
if i got your question right, you mean "what are php tags?" your should write PHP codes between <?php ... ?> where ... should be replaced by codes that you need. But if you mean "what are php codes?": there are some default codes that you may find them on php.net, and the other part is codes (Functions or classes) that other programmers develops..
To enable dynamic loading of extensions, set enable_dl option in php.ini to 1
http://www.php.net/quickref.php
There are thousands.
PHP can create images of different sizes. It depends on a particular image.
Image Slideshow is very difficult using php. Instead store the image files in an image folder and apply slideshow to them using javascript. Here's a reference to automatic slideshow using javascript: How_do_you_create_slide_show_using_javascript_code
By sending messages to the MySQL server, you can communicate with the database. To submit SQL queries to the database, you use PHP functions. You don't need to know how to communicate with MySQL because PHP takes care of that. You only need to be familiar with SQL queries and PHP functions. To learn more about data science please visit- Learnbay.co
PHP is simpler and also better, personally i recommend you to learn php. First thing you should know about programming is it never ends.. Everyday programmers develops new functions/classes and also availabilities of programming languages increases.. What you need to start is learning basic and default codes which comes with php engine. Download PHP Engine from: php.net Then use w3schools.com to learn php after that to extend your knowledge use php.net to find out what functions exists and how you should use them. If you do what i told you, after a month you will become a programmer, if you already know another programming language i believe you can learn php in a week. Keep it in mind before starting PHP you should know HTML which can be learn by same site (w3schools.com).