The following are examples of php_flowtime.d.

This is a simple script to trace the flow of PHP functions.
Here it traces the example program, Code/Php/func_abc.php

# php_flowtime.d
  C TIME(us)         FILE             DELTA(us)  -- FUNC
  0 3646108339057    func_abc.php             9 -> func_a
  0 3646108339090    func_abc.php            32   -> sleep
  0 3646109341043    func_abc.php       1001953   <- sleep
  0 3646109341074    func_abc.php            31   -> func_b
  0 3646109341098    func_abc.php            23     -> sleep
  0 3646110350712    func_abc.php       1009614     <- sleep
  0 3646110350745    func_abc.php            32     -> func_c
  0 3646110350768    func_abc.php            23       -> sleep
  0 3646111362323    func_abc.php       1011554       <- sleep
  0 3646111362351    func_abc.php            27     <- func_c
  0 3646111362361    func_abc.php            10   <- func_b
  0 3646111362370    func_abc.php             9 <- func_a
^C

The fifth column is indented by 2 spaces to show when a new function begins.
This shows which function is calling which - the output above begins by
showing that func_a() began; slept, and returned from sleep; and then called
func_b().

The TIME(us) column shows time since boot.

The DELTA(us) column shows time from that line to the previous line, and
so can be a bit tricky to read. For example, the second line of data output
(skipping the header) reads as "the time from func_a() beginning to
calling the sleep function beginning was 32 microseconds".

The FILE column shows file that was being executed. 

If the output looks shuffled, check the CPU "C" and "TIME" columns, and
post sort based on TIME if necessary.

See Notes/ALLflow_notes.txt for important notes about reading flow outputs.