PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: substr on short vs. long strings

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Result: Discarded

The test labeled "long (x200)" was the faster by 0.0152 seconds, (3.053% faster)

long (x200) 100%
short 96.947%

The long (x200) test took 0.4829 seconds.
The short test took 0.4981 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 123,680 loops for a total of 2,473,600 runs.

  • Line execution difference (0.000006) milliseconds.
  • Avg difference (0.760) milliseconds per 123,680 loops.
  • Total difference 15.21 milliseconds for 2,473,600 loops

The iteration variablity for Code 1 was (2.6047) milliseconds and Code 2 was (1.7432) milliseconds. The lower and the closer together there values are the more accurate the results are.

Code

The first test, "short", was:

for ($j = 0; $j < 100; $j++)
	$GLOBALS['dummy2'] = substr($GLOBALS['dummy_short'], 10, 10);

The second test, "long (x200)", was:

for ($j = 0; $j < 100; $j++)
	$GLOBALS['dummy2'] = substr($GLOBALS['dummy_long'], 10, 10);

Running: Linux (x86_64:1 GB) PHP (7.2.34-21+ubuntu16.04.1+deb.sury.org+1)