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QuickHashStringIntHash::saveToFile — This method stores an in-memory hash to disk
public QuickHashStringIntHash::saveToFile ( string $filename ) : void
This method stores an existing hash to a file on disk, in the same format that loadFromFile() can read.
filename
The filename of the file to store the hash in.
No value is returned.
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https://www.php.net/manual/en/quickhashstringinthash.savetofile.php