PHP is a fairly large language but most PHP software platforms including OpenCart only use a small subset of its features.
If you're looking to improve your PHP, it makes sense to focus on learning the features of the language that are most commonly used.
Well I ran some searches on the OpenCart source code to help identify the most important PHP functions to learn to help you develop OpenCart sites:
https://www.antropy.co.uk/blog/efficien ... evelopers/
Guru Member
http://www.php.net to start developing your skills. After 15 years of PHP practice, it is still a fundamental and reliable website as the source of information by following the PHP industry.
Dedication and passion goes to those who are able to push and merge a project.
Regards,
Straightlight
Programmer / Opencart Tester