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85 lines
1.5 KiB
PHP
85 lines
1.5 KiB
PHP
--TEST--
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Testing randomization of shuffle() and str_shuffle().
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--FILE--
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<?php
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function stats($f, $a) {
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$times = 90000;
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print "$f\n";
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ksort($a);
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foreach($a as $k => $v)
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print "$k: $v: " . sprintf('%0.3f', $v / $times) . "\n";
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}
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$a = array();
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$times = 90000;
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for ($i = 0; $i < $times; $i++) {
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$p = range(1,4);
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shuffle($p);
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$s = join('', $p);
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if (empty($a[$s])) $a[$s] = 0;
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$a[$s]++;
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}
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stats('shuffle', $a);
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$a = array();
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$times = 90000;
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for ($i = 0; $i < $times; $i++) {
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$p = '1234';
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$s = str_shuffle($p);
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if (empty($a[$s])) $a[$s] = 0;
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$a[$s]++;
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}
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stats('str_shuffle', $a);
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?>
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--EXPECTF--
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shuffle
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1234: 3%d: 0.04%d
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1243: 3%d: 0.04%d
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1324: 3%d: 0.04%d
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1342: 3%d: 0.04%d
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1423: 3%d: 0.04%d
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1432: 3%d: 0.04%d
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2134: 3%d: 0.04%d
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2143: 3%d: 0.04%d
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2314: 3%d: 0.04%d
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2341: 3%d: 0.04%d
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2413: 3%d: 0.04%d
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2431: 3%d: 0.04%d
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3124: 3%d: 0.04%d
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3142: 3%d: 0.04%d
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3214: 3%d: 0.04%d
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3241: 3%d: 0.04%d
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3412: 3%d: 0.04%d
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3421: 3%d: 0.04%d
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4123: 3%d: 0.04%d
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4132: 3%d: 0.04%d
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4213: 3%d: 0.04%d
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4231: 3%d: 0.04%d
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4312: 3%d: 0.04%d
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4321: 3%d: 0.04%d
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str_shuffle
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1234: 3%d: 0.04%d
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1243: 3%d: 0.04%d
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1324: 3%d: 0.04%d
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1342: 3%d: 0.04%d
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1423: 3%d: 0.04%d
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1432: 3%d: 0.04%d
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2134: 3%d: 0.04%d
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2143: 3%d: 0.04%d
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2314: 3%d: 0.04%d
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2341: 3%d: 0.04%d
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2413: 3%d: 0.04%d
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2431: 3%d: 0.04%d
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3124: 3%d: 0.04%d
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3142: 3%d: 0.04%d
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3214: 3%d: 0.04%d
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3241: 3%d: 0.04%d
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3412: 3%d: 0.04%d
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3421: 3%d: 0.04%d
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4123: 3%d: 0.04%d
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4132: 3%d: 0.04%d
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4213: 3%d: 0.04%d
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4231: 3%d: 0.04%d
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4312: 3%d: 0.04%d
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4321: 3%d: 0.04%d
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