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 0.0009 seconds, (0.124% faster)

substr() 100%
isset {5} 99.876%

The substr() test took 0.738 seconds.
The isset {5} test took 0.7389 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 158,171 loops for a total of 3,163,420 runs.

  • Line execution difference (0.000000) milliseconds.
  • Avg difference (0.046) milliseconds per 158,171 loops.
  • Total difference 0.92 milliseconds for 3,163,420 loops

The iteration variablity for Code 1 was (8.5663) milliseconds and Code 2 was (5.6156) 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 (7.2.34-8+ubuntu16.04.1+deb.sury.org+1)