PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: substr vs. strpos (long)

4800 character string, check if a substring exists in a defined location, both pass and fail loops.

View test history (36) Run this test again Return to test menu

Result: Discarded

The test labeled "substr()" was the faster by 0.02 seconds, (4.002% faster)

substr() 100%
strpos() 95.998%

The substr() test took 0.4802 seconds.
The strpos() test took 0.5002 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 128,256 loops for a total of 2,565,120 runs.

  • Line execution difference (0.000008) milliseconds.
  • Avg difference (1.001) milliseconds per 128,256 loops.
  • Total difference 20.02 milliseconds for 2,565,120 loops

The iteration variablity for Code 1 was (0.9926) milliseconds and Code 2 was (1.2352) milliseconds. The lower and the closer together there values are the more accurate the results are.

Code

The first test, "substr()", was:

for ($j = 0; $j < 40; $j++)
	$GLOBALS['dummy'] = substr($GLOBALS['dummy_match'], 0, 5) === '01234';
for ($j = 0; $j < 40; $j++)
	$GLOBALS['dummy'] = substr($GLOBALS['dummy_fail'], 0, 5) === '01234';

The second test, "strpos()", was:

for ($j = 0; $j < 40; $j++)
	$GLOBALS['dummy'] = strpos($GLOBALS['dummy_match'], '01234') === 0;
for ($j = 0; $j < 40; $j++)
	$GLOBALS['dummy'] = strpos($GLOBALS['dummy_fail'], '01234') === 0;

Running: Linux (x86_64:1 GB) PHP (7.2.19-1+ubuntu16.04.1+deb.sury.org+1)