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 (1) Run this test again Return to test menu

Result: Discarded

The test labeled ""$string"" was the faster by 0.0308 seconds, (4.552% faster)

"$string" 100%
(string) 95.448%

The "$string" test took 0.6462 seconds.
The (string) test took 0.677 seconds.


Each test case ran 20 random code order iterations consisting of 168,429 loops for a total of 3,368,580 runs.

  • Line execution difference (0.000009) milliseconds.
  • Avg difference (1.541) milliseconds per 168,429 loops.
  • Total difference 30.82 milliseconds for 3,368,580 loops

The iteration variablity for Code 1 was (5.2753) milliseconds and Code 2 was (2.4073) 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 (