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 "string" was the faster by 0.0215 seconds, (2.060% faster)

string 100%
integer 97.94%

The string test took 1.0217 seconds.
The integer test took 1.0432 seconds.


Each test case ran 20 random code order iterations consisting of 288,615 loops for a total of 5,772,300 runs.

  • Line execution difference (0.000004) milliseconds.
  • Avg difference (1.075) milliseconds per 288,615 loops.
  • Total difference 21.49 milliseconds for 5,772,300 loops

The iteration variablity for Code 1 was (2.9963) milliseconds and Code 2 was (0.7551) 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 (