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PHP mt_rand() Randomosity Tester

+1 +10 +100 +1K +10K +MAX
range: 1-50, data points: 10,011, groups: 36
High / Low / Range / Average
Frequency: 239 / 167 / 72 / 200.22
Rows: 3 / 1 / 2 / 1.39
Frequency
Rows
239
1
237
1
232
1
227
1
226
1
223
1
219
2
217
1
214
1
213
1
210
1
209
3
208
1
205
1
204
1
202
2
200
1
199
3
198
1
197
1
196
3
195
2
194
1
193
2
192
2
191
1
190
2
188
2
187
1
186
1
185
1
180
1
178
1
175
2
173
1
167
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 50.

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

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