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WebDevLogs.com:
Which way to get the PHP self script name is the fastest?
January 12, 2007 @ 15:36:00

From the WebDevLogs.com blog today, there's some benchmarking results from Mgcci's look at PHP's methods for grabbing some common data - the script's own name. This includes the "magic" call to __FILE__:

The result shows that __FILE__ is the fastest, so use that when you don't have to use any other method to find the script's self. __FILE__ is a built in constant show the location of the running script.

He gives the benchmark output (time measurement) and includes the code that he used to perform the tests.

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