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 0.0748 seconds, (5.964% faster)

substr() 100%
isset {5} 94.036%

The substr() test took 1.1789 seconds.
The isset {5} test took 1.2537 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 282,921 loops for a total of 5,658,420 runs.

  • Line execution difference (0.000013) milliseconds.
  • Avg difference (3.739) milliseconds per 282,921 loops.
  • Total difference 74.77 milliseconds for 5,658,420 loops

The iteration variablity for Code 1 was (7.8159) milliseconds and Code 2 was (8.7242) 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)