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.

Run this test again Return to test menu

Historical Results

Based on (1) saved test runs, The test labeled ""$string"" was (on average) the faster by 0.0034 seconds, (0.604% faster)

"$string" 100%
(string) 99.396%

The "$string" test took 0.5619 seconds.
The (string) test took 0.5653 seconds.


Each test case ran 20 random code order iterations consisting of 144,956 loops for a total of 2,899,120 runs.

  • Line execution difference (0.000001) milliseconds.
  • Avg difference (0.000) milliseconds per 144,956 loops.
  • Total difference 3.41 milliseconds for 2,899,120 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.


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 (