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.

Run this test again Return to test menu

Historical Results

Based on (2) saved test runs, The test labeled "substr()" was (on average) the faster by 0.0126 seconds, (1.527% faster)

substr() 100%
isset {5} 98.473%

The substr() test took 0.8094 seconds.
The isset {5} test took 0.822 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 217,783 loops for a total of 4,355,650 runs.

  • Line execution difference (0.000003) milliseconds.
  • Avg difference (0.000) milliseconds per 217,783 loops.
  • Total difference 12.55 milliseconds for 4,355,650 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'], 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 (7.2.22-1+ubuntu16.04.1+deb.sury.org+1)