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 (1) saved test runs, The test labeled "(string)" was (on average) the faster by 0.0191 seconds, (1.825% faster)

(string) 100%
"$string" 98.175%

The (string) test took 1.026 seconds.
The "$string" test took 1.045 seconds.


Each test case ran 20 random code order iterations consisting of 291,321 loops for a total of 5,826,420 runs.

  • Line execution difference (0.000003) milliseconds.
  • Avg difference (0.000) milliseconds per 291,321 loops.
  • Total difference 19.07 milliseconds for 5,826,420 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 (