Vim is able to auto-complete syntax for some of the most popular programming languages, but it's not enabled by default.

Tutorial video:

While in command mode, enter the following

:set omnifunc=phpcomplete#CompletePHP

To start using PHP auto completion, press the Ctrl + x followed by Ctrl + o keys while writing some PHP functions.

Below is an example screenshot when pressing Ctrl + x followed by Ctrl + o after typing dat

Do note the function description provided at the top of the screen.

Automatically enable PHP autocomplete for every PHP file

To enable PHP autocomplete every time you open a PHP file, add this to your ~/.vimrc;

autocmd FileType php set omnifunc=phpcomplete#CompletePHP
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