PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: foreach reference reading

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Result: Discarded

The test labeled "non-referenced" was the faster by 0.0348 seconds, (3.349% faster)

non-referenced 100%
referenced 96.651%

The non-referenced test took 1.0029 seconds.
The referenced test took 1.0377 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 290,564 loops for a total of 5,811,280 runs.

  • Line execution difference (0.000006) milliseconds.
  • Avg difference (1.738) milliseconds per 290,564 loops.
  • Total difference 34.75 milliseconds for 5,811,280 loops

The iteration variablity for Code 1 was (0.5127) milliseconds and Code 2 was (1.8867) milliseconds. The lower and the closer together there values are the more accurate the results are.

Code

The first test, "non-referenced", was:

foreach ($GLOBALS['dummy'] as $k => $v)
	$v[0] + 1;
unset($v);

The second test, "referenced", was:

foreach ($GLOBALS['dummy'] as $k => &$v)
	$v[0] + 1;
unset($v);

Running: Linux (x86_64:1 GB) PHP (7.2.34-8+ubuntu16.04.1+deb.sury.org+1)