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So I was reading about PHP namespaces, and I realized that in versions earlier than 5.3, if you write
namespace MyNamespace
you get a parse error.
Is there any way to avoid this i.e. make namespaces backwards-compatible, so the code doesn’t simply crash?
Short Answer: No.
Longer Answer: (added to capture useful information from other deleted answers). The new Syntax will cause parse errors in PHP, so you can’t use a customer error handler to catch errors generated in versions < 5.3. In theory you could write a pre-processor the scans and/or does a lex/parse on the source and then write something back out that would be PHP 5.2 compatible, but that creates more problems than it solves.