Question: how to get multiple selected checkbox value in php?
Answer: To get value of a checked checkbox :
To get value of multiple checked checkboxes, name attribute in HTML input type=”checkbox” tag must be initialize with an array, to do this write [ ] at the end of it's name attribute :
HTML Codes: php_checkbox.php. ... 
PHP Codes: checkbox_value.php.
CSS File: php_checkbox.css.
Conclusion: