[jorgsowa]

zend_ast_valid_var_name() treated 0x7f as a name character, but unquoted identifiers haven't allowed it since PHP 7.1. As a result, names containing it were exported bare ($o->a\177, C::\177), which produces code that doesn't parse. They are now exported quoted ($o->{'a\177'}, C::{'\177'}).

Retargeted from PHP-8.4 to PHP-8.6. The invalid-name quoting from the earlier version of this PR is already in 8.6 through #22294. String interpolation in 8.6 always braces variables, so the encaps change, the ${expr} deprecation and the "{$a}->b" case don't apply.

[jorgsowa]

Follow-up of #25221

CC: @iliaal

[iliaal]

The interpolation case is fixed. Separately, the same encaps condition still exports "{$a}->b" as "$a->b", which reparses as a property fetch.

[jorgsowa]

Retargeted to PHP-8.6. The invalid-name quoting is already there via #22294, and 8.6 braces every interpolated variable, so the ${'---'} and "{$a}->b" cases are already handled. That leaves only the 0x7f fix.