PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: global vs. $GLOBALS

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Result: Discarded

The test labeled "global" was the faster by 0.016 seconds, (2.901% faster)

global 100%
$GLOBALS 97.099%

The global test took 0.5367 seconds.
The $GLOBALS test took 0.5527 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 127,670 loops for a total of 2,553,400 runs.

  • Line execution difference (0.000006) milliseconds.
  • Avg difference (0.802) milliseconds per 127,670 loops.
  • Total difference 16.03 milliseconds for 2,553,400 loops

The iteration variablity for Code 1 was (3.2679) milliseconds and Code 2 was (3.6114) milliseconds. The lower and the closer together there values are the more accurate the results are.

Code

The first test, "global", was:

for ($i = 0; $i < 100; $i++)
{
	global $dummy, $dummy2;

	$dummy2 = $dummy;
}

The second test, "$GLOBALS", was:

for ($i = 0; $i < 100; $i++)
	$GLOBALS['dummy2'] = $GLOBALS['dummy'];

Running: Linux (x86_64:1 GB) PHP (7.2.25-1+ubuntu16.04.1+deb.sury.org+1)