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 (4) Run this test again Return to test menu

Result: Saved

The test labeled "(string)" was the faster by 0.0077 seconds, (1.173% faster)

(string) 100%
"$string" 98.827%

The (string) test took 0.6465 seconds.
The "$string" test took 0.6542 seconds.


Each test case ran 20 random code order iterations consisting of 157,414 loops for a total of 3,148,280 runs.

  • Line execution difference (0.000002) milliseconds.
  • Avg difference (0.384) milliseconds per 157,414 loops.
  • Total difference 7.67 milliseconds for 3,148,280 loops

The iteration variablity for Code 1 was (1.8618) milliseconds and Code 2 was (1.9395) 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 (