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 (66) saved test runs, The test labeled "substr()" was (on average) the faster by 0.0138 seconds, (1.817% faster)

substr() 100%
strpos() 98.183%

The substr() test took 0.7475 seconds.
The strpos() test took 0.7613 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 184,164 loops for a total of 3,683,278 runs.

  • Line execution difference (0.000004) milliseconds.
  • Avg difference (0.000) milliseconds per 184,164 loops.
  • Total difference 13.84 milliseconds for 3,683,278 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 (7.2.15-1+ubuntu16.04.1+deb.sury.org+1)