Convert 8 bytes to a signed long (64 bit)

I'm reading 8 bytes from a socket i开发者_如何学编程n PHP, and want to transform them into a 64 bit signed integer.

• How can I do this in 64 bit PHP? unpack doesn't support 64 bit numbers
• In 32 bit PHP, is there a way to make it into a string that can be used by BCMath?

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Perhaps Converting byte-stream into numeric data-type will help...