andrey Wed Oct 23 15:33:13 2002 EDT
Added files:
/php4/ext/standard/tests/strings 004.phpt
Log:
Test case regarding randomization of shuffle() and str_shuffle().
The code was provided by Adam Trachtenberg : adam trachtenberg com
Index: php4/ext/standard/tests/strings/004.phpt
+++ php4/ext/standard/tests/strings/004.phpt
--TEST--
Testing randomization of shuffle() and str_shuffle().
--FILE--
<?php
function stats($f, $a) {
$times = 90000;
print "$f\n";
ksort($a);
foreach($a as $k => $v)
print "$k: $v: " . sprintf('%0.3f', $v / $times) . "\n";
}
$a = array();
$times = 90000;
for ($i = 0; $i < $times; $i++) {
$p = range(1,4);
shuffle($p);
$s = join('', $p);
if (empty($a[$s])) $a[$s] = 0;
$a[$s]++;
}
stats('shuffle', $a);
$a = array();
$times = 90000;
for ($i = 0; $i < $times; $i++) {
$p = '1234';
$s = str_shuffle($p);
if (empty($a[$s])) $a[$s] = 0;
$a[$s]++;
}
stats('str_shuffle', $a);
?>
--EXPECTF--
shuffle
1234: 3%d: 0.04%d
1243: 3%d: 0.04%d
1324: 3%d: 0.04%d
1342: 3%d: 0.04%d
1423: 3%d: 0.04%d
1432: 3%d: 0.04%d
2134: 3%d: 0.04%d
2143: 3%d: 0.04%d
2314: 3%d: 0.04%d
2341: 3%d: 0.04%d
2413: 3%d: 0.04%d
2431: 3%d: 0.04%d
3124: 3%d: 0.04%d
3142: 3%d: 0.04%d
3214: 3%d: 0.04%d
3241: 3%d: 0.04%d
3412: 3%d: 0.04%d
3421: 3%d: 0.04%d
4123: 3%d: 0.04%d
4132: 3%d: 0.04%d
4213: 3%d: 0.04%d
4231: 3%d: 0.04%d
4312: 3%d: 0.04%d
4321: 3%d: 0.04%d
str_shuffle
1234: 3%d: 0.04%d
1243: 3%d: 0.04%d
1324: 3%d: 0.04%d
1342: 3%d: 0.04%d
1423: 3%d: 0.04%d
1432: 3%d: 0.04%d
2134: 3%d: 0.04%d
2143: 3%d: 0.04%d
2314: 3%d: 0.04%d
2341: 3%d: 0.04%d
2413: 3%d: 0.04%d
2431: 3%d: 0.04%d
3124: 3%d: 0.04%d
3142: 3%d: 0.04%d
3214: 3%d: 0.04%d
3241: 3%d: 0.04%d
3412: 3%d: 0.04%d
3421: 3%d: 0.04%d
4123: 3%d: 0.04%d
4132: 3%d: 0.04%d
4213: 3%d: 0.04%d
4231: 3%d: 0.04%d
4312: 3%d: 0.04%d
4321: 3%d: 0.04%d
--
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