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# __construct()
 - sfI18nPhpExtractor implements the sfI18nExtractorInterface interface
# ->extract()
 -  extracts strings from PHP files
 -  takes into account the  helper
 -  takes into account calls in an action file
 -  extracts strings from '' and "" quoted strings
 -  does not care if you add some whitespaces
 -  extracts strings from HEREDOC quoted strings
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