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.

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Result: Discarded

The test labeled "substr()" was the faster by 0.0205 seconds, (1.960% faster)

substr() 100%
isset {5} 98.04%

The substr() test took 1.0239 seconds.
The isset {5} test took 1.0444 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 294,802 loops for a total of 5,896,040 runs.

  • Line execution difference (0.000003) milliseconds.
  • Avg difference (1.024) milliseconds per 294,802 loops.
  • Total difference 20.47 milliseconds for 5,896,040 loops

The iteration variablity for Code 1 was (0.4159) milliseconds and Code 2 was (0.8650) 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 (7.2.34-18+ubuntu16.04.1+deb.sury.org+1)