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.

Run this test again Return to test menu

Historical Results

Based on (2) saved test runs, The test labeled "substr()" was (on average) the faster by 0.0026 seconds, (0.337% faster)

substr() 100%
strpos() 99.663%

The substr() test took 0.78 seconds.
The strpos() test took 0.7827 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 213,818 loops for a total of 4,276,350 runs.

  • Line execution difference (0.000001) milliseconds.
  • Avg difference (0.000) milliseconds per 213,818 loops.
  • Total difference 2.64 milliseconds for 4,276,350 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, "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 (7.2.34-18+ubuntu16.04.1+deb.sury.org+1)