PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: substr on short vs. long strings

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Result: Discarded

The test labeled "short" was the faster by 0.0234 seconds, (2.519% faster)

short 100%
long (x200) 97.481%

The short test took 0.9054 seconds.
The long (x200) test took 0.9288 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 171,792 loops for a total of 3,435,840 runs.

  • Line execution difference (0.000007) milliseconds.
  • Avg difference (1.170) milliseconds per 171,792 loops.
  • Total difference 23.39 milliseconds for 3,435,840 loops

The iteration variablity for Code 1 was (8.0767) milliseconds and Code 2 was (9.9551) milliseconds. The lower and the closer together there values are the more accurate the results are.

Code

The first test, "short", was:

for ($j = 0; $j < 100; $j++)
	$GLOBALS['dummy2'] = substr($GLOBALS['dummy_short'], 10, 10);

The second test, "long (x200)", was:

for ($j = 0; $j < 100; $j++)
	$GLOBALS['dummy2'] = substr($GLOBALS['dummy_long'], 10, 10);

Running: Linux (x86_64:1 GB) PHP (7.2.25-1+ubuntu16.04.1+deb.sury.org+1)