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 (2) saved test runs, The test labeled "(string)" was (on average) the faster by 0.0038 seconds, (0.453% faster)

(string) 100%
"$string" 99.547%

The (string) test took 0.8439 seconds.
The "$string" test took 0.8477 seconds.


Each test case ran 20 random code order iterations consisting of 202,657 loops for a total of 4,053,140 runs.

  • Line execution difference (0.000001) milliseconds.
  • Avg difference (0.000) milliseconds per 202,657 loops.
  • Total difference 3.84 milliseconds for 4,053,140 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 (