Why does it show negative number of MemUse?
Interpreting xhprof results - why yield negative values of MemUse?
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Functions can release more memory than they allocate. (Note: a function can release memory allocated else where.)
For example, consider a function
a()which callsb(). Say,b()allocates a string or array and returns it toa()which then uses it locally and thena()completes. In this case,b()'s memory allocation will be+ve, whereasa()'s net memory allocation will be-ve()(because it was responsible for free'ing memory allocated inb()).