First I would start with the basics

• HTML – http://www.sonarlearning.co.uk/coursepage.php?topic=web&course=html 
• HTML 5 – http://www.sonarlearning.co.uk/coursepage.php?topic=web&course=ext-html5 
• CSS – http://www.sonarlearning.co.uk/coursepage.php?topic=web&course=css 
• CSS 3 –  http://www.sonarlearning.co.uk/coursepage.php?topic=web&course=ext-css3 

Then move onto scripting

• JavaScript – http://www.sonarlearning.co.uk/coursepage.php?topic=web&course=javascript 
• jQuery – http://www.sonarlearning.co.uk/coursepage.php?topic=web&course=jquery 

Then Server side programming

• PHP – http://www.sonarlearning.co.uk/coursepage.php?topic=web&course=ext-php

Once you have done all of this you should be all good to go to create any website.

i have a basic knowledge on HTML & CSS. But I have no knowledge about JS & jQuery. Is it importent for learning PHP?

Techincally you don’t for PHP but when creating websites they will intertwine so it’s best you learn them all.

To become a Web Developer, you should have an understanding of HTML, CSS, and JavaScript. It's also recommended to learn about CSS and CSS frameworks. Developing Agentur fundamental web development skills will give you the foundation and logic for communicating with programming languages.Website Agentur​ who pursue a bachelor's degree from a four-year college or university typically earn a Bachelor of Science in computer science or a related field.