PHP Benchmarks

Performance comparison of PHP code alternatives.

Test: (string) vs. interpolate

Common from perl, many people use double quotes to force a string value.

View test history (8) Run this test again Return to test menu

Result: Discarded

The test labeled ""$string"" was the faster by 0.0185 seconds, (2.761% faster)

"$string" 100%
(string) 97.239%

The "$string" test took 0.6506 seconds.
The (string) test took 0.669 seconds.


Each test case ran 20 random code order iterations consisting of 147,986 loops for a total of 2,959,720 runs.

  • Line execution difference (0.000006) milliseconds.
  • Avg difference (0.924) milliseconds per 147,986 loops.
  • Total difference 18.47 milliseconds for 2,959,720 loops

The iteration variablity for Code 1 was (3.5540) milliseconds and Code 2 was (4.2817) milliseconds. The lower and the closer together there values are the more accurate the results are.


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 (