PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: integer vs. string keys

Note that integers are being accessed as integers, strings as strings. This is not testing auto-casting, just which is faster when used consistently.

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Result: Discarded

The test labeled "integer" was the faster by 0.0421 seconds, (3.829% faster)

integer 100%
string 96.171%

The integer test took 1.0562 seconds.
The string test took 1.0983 seconds.


Each test case ran 20 random code order iterations consisting of 298,261 loops for a total of 5,965,220 runs.

  • Line execution difference (0.000007) milliseconds.
  • Avg difference (2.103) milliseconds per 298,261 loops.
  • Total difference 42.06 milliseconds for 5,965,220 loops

The iteration variablity for Code 1 was (1.3042) milliseconds and Code 2 was (2.9376) milliseconds. The lower and the closer together there values are the more accurate the results are.


The first test, "integer", was:

$GLOBALS['dummy_i'][42] = 1;
$GLOBALS['dummy_i'][43] = 1;

$GLOBALS['dummy2'] = $GLOBALS['dummy_i'][42];
$GLOBALS['dummy2'] = $GLOBALS['dummy_i'][43];


The second test, "string", was:

$GLOBALS['dummy_s']['s42'] = 1;
$GLOBALS['dummy_s']['s43'] = 1;

$GLOBALS['dummy2'] = $GLOBALS['dummy_s']['s42'];
$GLOBALS['dummy2'] = $GLOBALS['dummy_s']['s43'];


Running: Linux (x86_64:1 GB) PHP (