Description:
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---
From manual page: http://www.php.net/locale.lookup#refsect1-locale.lookup-examples
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While the method signature is;
string locale_lookup ( array $langtag , string $locale [, bool $canonicalize = 
false [, string $default ]] )

Both examples states that:
echo locale_lookup($arr, 'de-DE-1996-x-prv1-prv2', 'en_US');

The writer forgot to add $canonicalize before $default