PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: substr on short vs. long strings

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Result: Discarded

The test labeled "long (x200)" was the faster by 0.0045 seconds, (0.748% faster)

long (x200) 100%
short 99.252%

The long (x200) test took 0.5979 seconds.
The short test took 0.6024 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 127,699 loops for a total of 2,553,980 runs.

  • Line execution difference (0.000002) milliseconds.
  • Avg difference (0.225) milliseconds per 127,699 loops.
  • Total difference 4.51 milliseconds for 2,553,980 loops

The iteration variablity for Code 1 was (7.7923) milliseconds and Code 2 was (8.1013) 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 (7.2.15-1+ubuntu16.04.1+deb.sury.org+1)