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We study phaseless sampling in spline spaces generated by B-splines witharbitrary knots. For real spline spaces, we give a necessary and sufficientcondition for a sequence of sampling points to admit a local phase retrieval ofany nonseparable function. We also study phaseless sampling in complex splinespaces and illustrate that phase retrieval is impossible in this case.Nevertheless, we show that phaseless sampling is possible. For any function $f$in a complex spline space, no mater it is separable or not, we show that$|f(x)|^2$ is uniquely determined and can be recovered linearly from itssampled values at a well chosen sequence of sampling points. We give necessaryand sufficient conditions for such sequences.

Phaseless Sampling and Linear Reconstruction of Functions in Spline Spaces