/**
* Randomizes the positions of the elements in an array.
*
* @param array $array The array to be shuffled.
*
* @return void
*/
public static function shuffle($array)
{
assert('is_carray($array)', vs(isset($this), get_defined_vars()));
$array = splarray($array);
// The Fisher-Yates algorithm.
for ($i = $array->getSize() - 1; $i > 0; $i--) {
$exchangeIdx = CMathi::intervalRandom(0, $i);
$save = $array[$exchangeIdx];
$array[$exchangeIdx] = $array[$i];
$array[$i] = $save;
}
}
/**
* Randomizes the positions of the characters in a string and returns the new string.
*
* @param string $string The string to be shuffled.
*
* @return string The shuffled string.
*/
public static function shuffle($string)
{
assert('is_cstring($string)', vs(isset($this), get_defined_vars()));
// The Fisher-Yates algorithm.
for ($i = self::length($string) - 1; $i > 0; $i--) {
$exchangeIdx = CMathi::intervalRandom(0, $i);
$save = self::charAt($string, $exchangeIdx);
self::setCharAt($string, $exchangeIdx, self::charAt($string, $i));
self::setCharAt($string, $i, $save);
}
return $string;
}
/**
* Randomizes the positions of the characters in a string and returns the new string.
*
* @param string $string The string to be shuffled.
*
* @return string The shuffled string.
*/
public static function shuffle($string)
{
assert('is_cstring($string)', vs(isset($this), get_defined_vars()));
// The Fisher-Yates algorithm.
for ($i = strlen($string) - 1; $i > 0; $i--) {
$exchangeIdx = CMathi::intervalRandom(0, $i);
$save = $string[$exchangeIdx];
$string[$exchangeIdx] = $string[$i];
$string[$i] = $save;
}
return $string;
}
public function testIntervalRandom()
{
for ($i = 0; $i < 10; $i++) {
$rnd = CMathi::intervalRandom(12, 34);
$this->assertTrue(12 <= $rnd && $rnd <= 34);
}
for ($i = 0; $i < 10; $i++) {
$rnd = CMathi::intervalRandom(56, 78);
$this->assertTrue(56 <= $rnd && $rnd <= 78);
}
for ($i = 0; $i < 10; $i++) {
$rnd = CMathi::intervalRandom(56.01, 78.01000000000001);
$this->assertTrue(56 <= $rnd && $rnd <= 78);
}
}
