PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: (string) vs. concat

Concatenating to a string always results in a string, but isn't a cast faster?

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Historical Results

Based on (5) saved test runs, The test labeled "(string)" was (on average) the faster by 0.0082 seconds, (0.988% faster)

(string) 100%
$string . '' 99.012%

The (string) test took 0.8169 seconds.
The $string . '' test took 0.825 seconds.

Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 209,447 loops for a total of 4,188,940 runs.

  • Line execution difference (0.000002) milliseconds.
  • Avg difference (0.000) milliseconds per 209,447 loops.
  • Total difference 8.15 milliseconds for 4,188,940 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, "(string)", was:

for ($j = 0; $j < 1000; $j++)
	$GLOBALS['dummy'] = (string) $j;

The second test, "$string . ''", was:

for ($j = 0; $j < 1000; $j++)
	$GLOBALS['dummy'] = $j . '';

Running: Linux (x86_64:1 GB) PHP (7.2.15-1+ubuntu16.04.1+deb.sury.org+1)