sys(2015) is based on the following
'Calling SYS(2015) more than once during the same millisecond interval will return a unique character string.'
Whilst PHP doesn't have such a function, it's easy to simulate. Probably the easiest way to get a unique value in PHP is to md5() a microtime value.
'microtime() returns the current Unix timestamp with microseconds. This function is only available on operating systems that support the gettimeofday() system call.'
md5 returns a string and microtime returns a value determined by the parameter set.See http://au3.php.net/microtime
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VFP and PHP are the best of both worlds :-)