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Fix some PHP 7.2 warnings "PHP Warning: Use of undefined constant ..."
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@ -1826,7 +1826,7 @@ abstract class Merge
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}
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// Apply HTML formatting to target document, if possible
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// check if we can use the XSL extension, to not give a fatal error and rendering whole merge-print non-functional
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if (class_exists(XSLTProcessor) && class_exists(DOMDocument) && $this->parse_html_styles)
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if (class_exists('XSLTProcessor') && class_exists('DOMDocument') && $this->parse_html_styles)
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{
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try
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{
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