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  Strings: Call by ref vs call by value for 1 char string
Call by Ref 0.0022 Call by Value x 1.05 faster 0.0021
  Strings: Call by ref vs call by value for 10K string
Call by Ref x 1.07 faster 0.0044 Call by Value 0.0047
  Strings: Call by ref vs call by value for 100K string
Call by Ref 0.0291 Call by Value x 1.18 faster 0.0246
  Arrays: Call by ref vs call by value
Call by Ref x 9.67 faster 0.0021 Call by Value 0.0203
  Objects: Call by ref vs call by value
Call by Ref 0.0076 Call by Value x 1.23 faster 0.0062
  Objects: Return by ref vs by value
Return by Ref $x =& $f() x 1.08 faster 0.0012 Return by Value 0.0013
  Objects: Return by partial ref vs by value
Return by Partial Ref $x = f() x 1.07 faster 0.0014 Return by Value 0.0015

Testing PHP 5.0.0b4 Completed on WINNT. Benchmark done on: 29-Feb-2004 14:32:47