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 (7) saved test runs, The test labeled "substr()" was (on average) the faster by 0.0083 seconds, (0.937% faster)

substr() 100%
isset {5} 99.063%

The substr() test took 0.8818 seconds.
The isset {5} test took 0.8901 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 238,967 loops for a total of 4,779,349 runs.

  • Line execution difference (0.000002) milliseconds.
  • Avg difference (0.000) milliseconds per 238,967 loops.
  • Total difference 8.34 milliseconds for 4,779,349 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 (7.2.34-21+ubuntu16.04.1+deb.sury.org+1)