## Test: set duplicates vs. !isset

This checks the cost of writing vs. the cost of checking if you're already written - for values that commonly overlap.

View test history (1) Run this test again Return to test menu## Result: Discarded

The test labeled "**set**" was the faster by

*0.027*seconds, (2.788% faster)

The **set** test took **0.9427** seconds.

The **!isset()** test took **0.9697** seconds.

## Nitty-Gritty

Each test case ran 20 random code order iterations consisting of 271,607 loops for a total of 5,432,140 runs.

- Line execution difference (0.000005) milliseconds.

- Avg difference (1.352) milliseconds per 271,607 loops.

- Total difference 27.03 milliseconds for 5,432,140 loops

The iteration variablity for Code 1 was (0.5883) milliseconds and Code 2 was (1.3534) milliseconds. The lower and the closer together there values are the more accurate the results are.

## Code

The first test, "**set**", was:

$array = array(); for ($n = 0; $n < 100; $n++) { $k = floor($n / 12); $array[$k] = $n + 42; }

The second test, "**!isset()**", was:

$array = array(); for ($n = 0; $n < 100; $n++) { $k = floor($n / 12); if (!isset($array[$k])) $array[$k] = $n + 42; }