PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: chr v. literal

How much worse is chr() than just a literal (if it's cleanly representable.)

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Historical Results

Based on (1) saved test runs, The test labeled "chr()" was (on average) the faster by 0.0171 seconds, (3.229% faster)

chr() 100%
literal 96.771%

The chr() test took 0.5137 seconds.
The literal test took 0.5308 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 148,470 loops for a total of 2,969,400 runs.

  • Line execution difference (0.000006) milliseconds.
  • Avg difference (0.000) milliseconds per 148,470 loops.
  • Total difference 17.14 milliseconds for 2,969,400 loops

The iteration variablity for Code 1 was (0.0000) milliseconds and Code 2 was (0.0000) milliseconds. The lower and the closer together there values are the more accurate the results are.

Code

The first test, "chr()", was:

$GLOBALS['dummy'] = chr(65);

The second test, "literal", was:

$GLOBALS['dummy'] = 'A';

Running: Linux (x86_64:1 GB) PHP (7.2.19-1+ubuntu16.04.1+deb.sury.org+1)