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 (2) Run this test again Return to test menu

Result: Discarded

The test labeled "strpos()" was the faster by 0.0205 seconds, (2.499% faster)

strpos() 100%
substr() 97.501%

The strpos() test took 0.8009 seconds.
The substr() test took 0.8215 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 195,447 loops for a total of 3,908,940 runs.

  • Line execution difference (0.000005) milliseconds.
  • Avg difference (1.027) milliseconds per 195,447 loops.
  • Total difference 20.53 milliseconds for 3,908,940 loops

The iteration variablity for Code 1 was (5.9484) milliseconds and Code 2 was (4.6717) 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 (7.2.25-1+ubuntu16.04.1+deb.sury.org+1)