but because early PHP was more simplistic than Perl it only has $.
Powershell also uses $ for variables.
Regardless of etymology of the $ sign and the usefulness of it, personally I like it because it makes it easier for me when I'm reading code, especially if you are scanning fast, to differentiate variables from symbols. Yes, you can get that with your editor too, but for me it is easier to associate the $ sign with a variable rather than a specific color, sometimes you don't have coloring available like when in command line going thru diffs, cat, nano etc.
https://stackoverflow.com/a/3073818
but because early PHP was more simplistic than Perl it only has $.
Powershell also uses $ for variables.
Regardless of etymology of the $ sign and the usefulness of it, personally I like it because it makes it easier for me when I'm reading code, especially if you are scanning fast, to differentiate variables from symbols. Yes, you can get that with your editor too, but for me it is easier to associate the $ sign with a variable rather than a specific color, sometimes you don't have coloring available like when in command line going thru diffs, cat, nano etc.