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 (5) saved test runs, The test labeled "(string)" was (on average) the faster by 0.0019 seconds, (0.153% faster)

(string) 100%
"$string" 99.847%

The (string) test took 1.2335 seconds.
The "$string" test took 1.2354 seconds.


Each test case ran 20 random code order iterations consisting of 256,571 loops for a total of 5,131,424 runs.

  • Line execution difference (0.000000) milliseconds.
  • Avg difference (0.000) milliseconds per 256,571 loops.
  • Total difference 1.89 milliseconds for 5,131,424 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 (