PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: substr negative vs. strlen

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Historical Results

Based on (3) saved test runs, The test labeled "substr($var, -1)" was (on average) the faster by 0.0091 seconds, (1.527% faster)

substr($var, -1) 100%
strlen() 98.473%

The substr($var, -1) test took 0.5881 seconds.
The strlen() test took 0.5972 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 163,489 loops for a total of 3,269,787 runs.

  • Line execution difference (0.000003) milliseconds.
  • Avg difference (0.000) milliseconds per 163,489 loops.
  • Total difference 9.12 milliseconds for 3,269,787 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($var, -1)", was:

for ($j = 0; $j < 100; $j++)
	$GLOBALS['dummy2'] = substr($GLOBALS['dummy'], -1);

The second test, "strlen()", was:

for ($j = 0; $j < 100; $j++)
	$GLOBALS['dummy2'] = substr($GLOBALS['dummy'], strlen($GLOBALS['dummy']) - 1);

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