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 (3) saved test runs, The test labeled "(string)" was (on average) the faster by 0.0147 seconds, (1.818% faster)

(string) 100%
"$string" 98.182%

The (string) test took 0.7959 seconds.
The "$string" test took 0.8106 seconds.


Each test case ran 20 random code order iterations consisting of 189,163 loops for a total of 3,783,267 runs.

  • Line execution difference (0.000004) milliseconds.
  • Avg difference (0.000) milliseconds per 189,163 loops.
  • Total difference 14.73 milliseconds for 3,783,267 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 (