[php-src] Issue #8006: var_dump() function displays certain strings incorrectly

Issue: https://github.com/php/php-src/issues/8006 Comment Author: iluuu1994 @canajun2eh var_dump is used in CLI for debugging purposes as well. We could of course just escape special characters when you're in the browser. Since that's PHPs primary target it is somewhat surprising the output isn't escaped. That said, maybe consider using something more sophisticated like [Symfony's VarDumper component](https://symfony.com/doc/current/components/var_dumper.html). It'll escape the output for you and has coloring, collapsing, works better on deeply nested data structures, etc.