PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: substr on short vs. long strings

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Historical Results

Based on (3) saved test runs, The test labeled "short" was (on average) the faster by 0.0189 seconds, (1.867% faster)

short 100%
long (x200) 98.133%

The short test took 0.9932 seconds.
The long (x200) test took 1.0121 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 235,156 loops for a total of 4,703,113 runs.

  • Line execution difference (0.000004) milliseconds.
  • Avg difference (0.000) milliseconds per 235,156 loops.
  • Total difference 18.90 milliseconds for 4,703,113 loops

The iteration variablity for Code 1 was (0.0000) milliseconds and Code 2 was (0.0000) 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)