PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: substr($var, 5, 1) vs. isset && {5}

Return the nth character of a string, substring vs string array checking.

Run this test again Return to test menu

Historical Results

Based on (8) saved test runs, The test labeled "substr()" was (on average) the faster by 0.0034 seconds, (0.385% faster)

substr() 100%
isset {5} 99.615%

The substr() test took 0.8805 seconds.
The isset {5} test took 0.8839 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 205,941 loops for a total of 4,118,820 runs.

  • Line execution difference (0.000001) milliseconds.
  • Avg difference (0.000) milliseconds per 205,941 loops.
  • Total difference 3.41 milliseconds for 4,118,820 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 < 100; $j++)
	$GLOBALS['dummy2'] = substr($GLOBALS['dummy'], 5, 1);

The second test, "isset {5}", was:

for ($j = 0; $j < 100; $j++)
	$GLOBALS['dummy2'] = isset($GLOBALS['dummy']{5}) ? $GLOBALS['dummy']{5} : '';

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