PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: stripos vs. strtolower(substr)

Case insensitive search a string for a set of characters.

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Historical Results

Based on (4) saved test runs, The test labeled "stripos()" was (on average) the faster by 0.0307 seconds, (3.581% faster)

stripos() 100%
strtolower(substr()) 96.419%

The stripos() test took 0.8272 seconds.
The strtolower(substr()) test took 0.858 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 186,514 loops for a total of 3,730,275 runs.

  • Line execution difference (0.000008) milliseconds.
  • Avg difference (0.000) milliseconds per 186,514 loops.
  • Total difference 30.72 milliseconds for 3,730,275 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, "stripos()", was:

for ($j = 0; $j < 100; $j++)
	$GLOBALS['dummy2'] = stripos($GLOBALS['dummy'], 'xyz') != '';

The second test, "strtolower(substr())", was:

for ($j = 0; $j < 100; $j++)
	$GLOBALS['dummy2'] = strtolower(substr($GLOBALS['dummy'], 24, 4) == 'xyz');

Running: Linux (x86_64:1 GB) PHP (7.2.25-1+ubuntu16.04.1+deb.sury.org+1)