A great choice for editing php in your own android and with the same features as a profesional editor.
Whether you need to open and edit PHP files and develop PHP on your android device APhpEditor can do it all...

APhpEditor includes a feature-rich interface complete with automatic PHP syntax highlighting and an integrated Php 7 interpreter to can execute your php scripts.

Features:
-Syntax highlighting.
-Reformat code.
-Large files support.
-Php interpreter.
-Ftp client.
-Php console emulation input/output.
-Search feature.

To do:
-Code folding.
-Replace and search.