PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: foreach writing ref vs. key

No Description

Run this test again Return to test menu

Result: Discarded

The test labeled "non-referenced" was the faster by 0.0297 seconds, (3.498% faster)

non-referenced 100%
referenced 96.502%

The non-referenced test took 0.8207 seconds.
The referenced test took 0.8504 seconds.


Each test case ran 20 random code order iterations consisting of 150,765 loops for a total of 3,015,300 runs.

  • Line execution difference (0.000010) milliseconds.
  • Avg difference (1.487) milliseconds per 150,765 loops.
  • Total difference 29.75 milliseconds for 3,015,300 loops

The iteration variablity for Code 1 was (4.9046) milliseconds and Code 2 was (7.9754) 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)

The second test, "referenced", was:

foreach ($GLOBALS['dummy'] as $k => &$v)

Running: Linux (x86_64:1 GB) PHP (