(PECL quickhash >= Unknown)
QuickHashIntStringHash::saveToString — This method returns a serialized version of the hash
public QuickHashIntStringHash::saveToString ( ) : string
This method returns a serialized version of the hash in the same format that loadFromString() can read.
This method returns a string containing a serialized format of the hash. Each element is stored as a four byte value in the Endianness that the current system uses.
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https://www.php.net/manual/en/quickhashintstringhash.savetostring.php