$this and $that font-lock keywords are not constrained

[phil-s]

https://github.com/ejmr/php-mode/blob/master/php-mode.el#L1331

 ;; Highlight special variables
 ("\\$\\(this\\|that\\)" 1 font-lock-constant-face)

This pattern matches any variable starting with $this or $that.

e.g. $this_item has the $this part incorrectly highlighted.

This particular instance is presumably fixed like so:

 ("\\$\\(this\\|that\\)\\_>" 1 font-lock-constant-face)

I haven't tried to establish whether this is an isolated issue, or indicative of a more widespread problem.

[syohex]

Thanks for reporting issue. I have applied your patch at #306. Please check latest version.