The following PHPStorm Plugin I find very useful:
GitHub markdown plugin for intellij platform.
https://plugins.jetbrains.com/plugin/7701-gfm
Php Inspections (EA Extended)
https://plugins.jetbrains.com/plugin/7622-php-inspections-ea-extended-
Zero width characters locator
https://plugins.jetbrains.com/plugin/7448-zero-width-characters-locator