PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: substr($var, 25, 1) vs. isset && {25}

Return the nth character of a string when the character does not exist.

View test history (7) Run this test again Return to test menu

Result: Discarded

The test labeled "isset {5}" was the faster by 0.0508 seconds, (3.956% faster)

isset {5} 100%
substr() 96.044%

The isset {5} test took 1.2335 seconds.
The substr() test took 1.2844 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 281,025 loops for a total of 5,620,500 runs.

  • Line execution difference (0.000009) milliseconds.
  • Avg difference (2.541) milliseconds per 281,025 loops.
  • Total difference 50.81 milliseconds for 5,620,500 loops

The iteration variablity for Code 1 was (8.1295) milliseconds and Code 2 was (6.4332) 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'], 25, 1);

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

for ($j = 0; $j < 100; $j++)
	$GLOBALS['dummy2'] = isset($GLOBALS['dummy']{25}) ? $GLOBALS['dummy']{25} : '';

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