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@@ -25,7 +25,7 @@ namespace PhpOffice\PhpWord\Escaper;
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abstract class AbstractEscaper implements EscaperInterface
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{
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/**
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* @param string $input
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* @param ?string $input
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*
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* @return string
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*/
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@@ -47,7 +47,7 @@ class Rtf extends AbstractEscaper
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/**
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* @see http://www.randomchaos.com/documents/?source=php_and_unicode
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*
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* @param string $input
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* @param ?string $input
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*/
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protected function escapeSingleValue($input)
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{
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