Using PHP language server (Intelephense) appends typed text to variables on completion...

[superDuperCyberTechno]

When I start typing a variable name, useful suggestions pop up as they should, but selecting them appends the completion to the text I've already typed...

$var_name = 'string';
//if i start typing "$var_" and complete the suggestion, the following is outputted
$var_$var_name

I have only noticed this behaviour when completing variable names - functions etc. works exactly as you'd want (completion ignoring the part of the name that has already been typed).

I use ALE as a source for Deoplete - forgive me if this is an issue with Deoplete.

[superDuperCyberTechno]

I've fiddled around with the results and the data appended is reliant on the Vim iskeyword list. I had underscore removed from this list. Dollar sign was also not on this list. Adding them fixes the autocompletion. - Obviously this changes how Vim handles text but whatever.