feat: emit hreflang x-default with multiple translations#1
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get_alternate_links() only returned an x-default alternate when a single translation existed; with two or more it was dropped. x-default is the recommended fallback for multilingual pages, so emit it in the multi-alternate case too. The x-default link runs through the existing msls_output_get_alternate_links_default filter, so it stays customisable and can be suppressed by returning an empty string. Single-translation behaviour is unchanged.
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What
MslsOutput::get_alternate_links()only emitted anhreflang="x-default"alternate when asingle translation existed. With two or more translations — the normal multilingual case —
x-default was dropped and only language-specific alternates were returned.
x-defaultis the fallback search engines use when no otherhreflangmatches the visitor'slocale; Google and the W3C recommend it for multilingual pages. This emits it in the
multi-alternate case too.
How
$defaultthrough the existingmsls_output_get_alternate_links_defaultfilter and prepend it to the alternates.''from that filter suppresses x-default (opt-out). Single-translation behaviouris unchanged.
Tests
test_get_alternate_links_two_urlto assert the x-default alternate is present.test_get_alternate_links_x_default_suppressedcovering the empty-string opt-out.phpunitgreen (5/5 for alternate-links),phpcs(PHPCompatibility) clean,phpstanreportsno new errors in
MslsOutput.Refs