Update PDFMerger.php #55
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fixed typos in docstring used php shorthand for better code
updated docstring for function addString
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This pull request includes (TLDR;):
Return type modifications for method chaining:
src/PDFMerger/PDFMerger.php: Changed the return type of thesetFileNamemethod fromstringtoselfto allow method chaining.src/PDFMerger/PDFMerger.php: Changed the return type of theaddStringmethod fromstringtoselfto allow method chaining.Code simplification using null coalescing operator:
src/PDFMerger/PDFMerger.php: Replacedissetchecks with the null coalescing operator (??) in thedoMergemethod to simplify the code. [1] [2]