PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: substr($var, 5, 1) vs. isset && {5}

Return the nth character of a string, substring vs string array checking.

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Historical Results

Based on (17) saved test runs, The test labeled "substr()" was (on average) the faster by 0.0124 seconds, (1.531% faster)

substr() 100%
isset {5} 98.469%

The substr() test took 0.7954 seconds.
The isset {5} test took 0.8077 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 210,279 loops for a total of 4,205,581 runs.

  • Line execution difference (0.000003) milliseconds.
  • Avg difference (0.000) milliseconds per 210,279 loops.
  • Total difference 12.36 milliseconds for 4,205,581 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'], 5, 1);

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

for ($j = 0; $j < 100; $j++)
	$GLOBALS['dummy2'] = isset($GLOBALS['dummy']{5}) ? $GLOBALS['dummy']{5} : '';

Running: Linux (x86_64:1 GB) PHP (7.2.15-1+ubuntu16.04.1+deb.sury.org+1)