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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Historical Results

Based on (1) saved test runs, The test labeled "substr()" was (on average) the faster by 0.0297 seconds, (4.952% faster)

substr() 100%
isset {5} 95.048%

The substr() test took 0.5699 seconds.
The isset {5} test took 0.5996 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 121,971 loops for a total of 2,439,420 runs.

  • Line execution difference (0.000012) milliseconds.
  • Avg difference (0.000) milliseconds per 121,971 loops.
  • Total difference 29.69 milliseconds for 2,439,420 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 (7.2.25-1+ubuntu16.04.1+deb.sury.org+1)