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 0.0027 seconds, (0.520% faster)

short 100%
long (x200) 99.48%

The short test took 0.5238 seconds.
The long (x200) test took 0.5265 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 136,945 loops for a total of 2,738,900 runs.

  • Line execution difference (0.000001) milliseconds.
  • Avg difference (0.137) milliseconds per 136,945 loops.
  • Total difference 2.74 milliseconds for 2,738,900 loops

The iteration variablity for Code 1 was (2.0932) milliseconds and Code 2 was (1.5896) 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)