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 0.0185 seconds, (3.633% faster)

(string) 100%
"$string" 96.367%

The (string) test took 0.4911 seconds.
The "$string" test took 0.5097 seconds.


Each test case ran 20 random code order iterations consisting of 127,302 loops for a total of 2,546,030 runs.

  • Line execution difference (0.000007) milliseconds.
  • Avg difference (0.000) milliseconds per 127,302 loops.
  • Total difference 18.52 milliseconds for 2,546,030 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 (