Hide Ads
 Refresh   About   Tools 

PHP rand() Randomosity Tester

+1 +10 +100 +1K +10K +MAX
range: 1-500, data points: 16,688, groups: 30
High / Low / Range / Average
Frequency: 47 / 18 / 29 / 33.38
Rows: 36 / 1 / 35 / 16.67
Frequency
Rows
47
1
46
6
45
8
44
10
43
10
42
11
41
15
40
17
39
18
38
24
37
29
36
27
35
34
34
36
33
34
32
25
31
30
30
29
29
30
28
26
27
21
26
17
25
13
24
10
23
7
22
4
21
5
20
1
19
1
18
1

Test runs: 0Avg run : 0 seconds Test time: 0 seconds Data Save: 0 seconds Test Tools: Restart test: Random range 1 to: 1 2 3 4 5 10 50 100 500 1K 5K 10K 50K 100K Random Generator Method: SQLite ORDER BY RANDOM() PHP rand() PHP mt_rand() PHP random_int() Back to top


About the Randomosity Tester

This page tests the frequency distribution and timing of random number generation via these methods:

Random number results are stored in a test table. The test table is defined as:

CREATE TABLE 'test' ( 'id' INTEGER PRIMARY KEY, 'frequency' INTEGER DEFAULT '0' );

The table is initialized by creating all rows with frequency = 0. The number of rows in the table is defined by the range setting. The current test is set to use range: 1 to 500.

For each random number chosen, the table is updated via:

UPDATE test SET frequency = frequency + 1 WHERE id = :random_number

For SQLite tests, results are individually generated via the SQL call:

SELECT id FROM test ORDER BY RANDOM() LIMIT 1;

Generate more random numbers by clicking a  +  number button to start a test run.

Each test run is limted to ~1.42 seconds.

A Frequency of Frequencies chart displays:

This site was created with Open Source software. Find out more on Github: randomosity-tester v0.2.2

Back to top


Hide Ads