Don't panic: this deprecates `${var}`, which is a less-common syntax for interpolation, but leaves the most common ones, `$var` and `{$var}`, in place.
It reduces the number of slightly different ways to do one thing, and clears the ground for adding any-expression interpolation, which PHP is currently missing.
It reduces the number of slightly different ways to do one thing, and clears the ground for adding any-expression interpolation, which PHP is currently missing.