
Here's how:
1) Options -> preferences -> Text Editor -> Colors -> Advanced -> Custom Scripts
2) Save original HTML with PHP script
3) Browse it for Highlighter Script File
4) Edit the script
After this line: State=sphpvar
Add this line:
State=sphpvar2
After this line: sphpstring2 \\[^\\] sphpstring2 tphpstring
Add these lines:
sphpstring2 \$ sphpvar2 tphpvar
sphpvar2 [a-z_A-Z][a-z_A-Z0-9]* sphpstring2 tphpvar
5) Restart WeBuilder/Rapid PHP
This should do until we come with a better solution. I think it would be better to highlight variables inside strings with a differrent color.