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QuickHashStringIntHash::saveToString — This method returns a serialized version of the hash
public QuickHashStringIntHash::saveToString ( ) : string
This method returns a serialized version of the hash in the same format that loadFromString() can read.
This method returns a serialized format of an existing hash, in the same format that loadFromString() can read.
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https://www.php.net/manual/en/quickhashstringinthash.savetostring.php