PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: foreach reference reading

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Result: Saved

The test labeled "referenced" was the faster by 0.0232 seconds, (3.529% faster)

referenced 100%
non-referenced 96.471%

The referenced test took 0.6335 seconds.
The non-referenced test took 0.6567 seconds.


Each test case ran 20 random code order iterations consisting of 151,050 loops for a total of 3,021,000 runs.

  • Line execution difference (0.000008) milliseconds.
  • Avg difference (1.159) milliseconds per 151,050 loops.
  • Total difference 23.17 milliseconds for 3,021,000 loops

The iteration variablity for Code 1 was (4.3588) milliseconds and Code 2 was (4.4109) milliseconds. The lower and the closer together there values are the more accurate the results are.


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

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

The second test, "referenced", was:

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

Running: Linux (x86_64:1 GB) PHP (