所以我正在为我正在进行的Web应用程序开发课程的最终项目工作，我正在创建一个Powerball彩票生成器。为此，白球数不能重复。以下是我的代码到目前为止的样子：
<?php
for($x = 1; $x < 6; $x++){
//set each white ball variable (a through e) to a random number between 1 and 69
$a = floor((lcg_value() * 69 + 1));
$b = floor((lcg_value() * 69 + 1));
$c = floor((lcg_value() * 69 + 1));
$d = floor((lcg_value() * 69 + 1));
$e = floor((lcg_value() * 69 + 1));
//set powerball number variable to a number between 1 and 26
$f = floor((lcg_value() * 26 + 1));
//echo all white ball numbers and powerball number
echo "<b><u>Set #" . $x . "</u></b> - <b>White ball numbers are: </b>" . $a . " , " . $b . " , " . $c . " , " . $d . " , " . $e . ". <b>Powerball Number is </b>" . $f . ".<br />";
};
?>
这段代码的问题在于变量'a'到'e'有可能成为重复数字。我可以使用什么代码来确保变量'a'到'e'都不相同？我想过做的事情：
if($a != $b || $a != $c || $a || $d...){
//echo numbers
}else{
//generate new numbers
};
但这只是太多的工作，我总是试图找到最有效的编写代码的方法。我不想写更多代码而不是我需要的代码。任何帮助将不胜感激。先感谢您！
你可以这样生成数字：
$arr = range(1, 69);
shuffle($arr);
$a = $arr[0];
$b = $arr[1];
$c = $arr[2];
$d = $arr[3];
$e = $arr[4];
将它们添加到数组中并检查唯一性：
<?php
for($x = 1; $x < 6; $x++){
$unique = false;
while(!$unique) {
//set each white ball variable (a through e) to a random number between 1 and 69
$a = floor((lcg_value() * 69 + 1));
$b = floor((lcg_value() * 69 + 1));
$c = floor((lcg_value() * 69 + 1));
$d = floor((lcg_value() * 69 + 1));
$e = floor((lcg_value() * 69 + 1));
$numbers = array($a, $b, $c, $d, $e);
if(count($numbers) == count(array_unique($numbers)) {
$unique = true;
}
}
//set powerball number variable to a number between 1 and 26
$f = floor((lcg_value() * 26 + 1));
//echo all white ball numbers and powerball number
echo "<b><u>Set #" . $x . "</u></b> - <b>White ball numbers are: </b>" . $a . " , " . $b . " , " . $c . " , " . $d . " , " . $e . ". <b>Powerball Number is </b>" . $f . ".<br />";
}
while循环随机生成数字并动态检查重复项。
在这里测试一下：https://3v4l.org/odOqb 我已将随机数更改为较小的大小，以查看它是否确实创建了重复项。 但我还没有看到任何。
<?php
$arr =array();
for($x = 1; $x < 6; $x++){
//set each white ball variable (a through e) to a random number between 1 and 69
While (count($arr) != 5){
$arr[] = floor((lcg_value() * 6 + 1));
$arr = array_unique($arr);
}
//set powerball number variable to a number between 1 and 26
$f = floor((lcg_value() * 26 + 1));
Var_dump($arr);
//echo all white ball numbers and powerball number
//echo "<b><u>Set #" . $x . "</u></b> - <b>White ball numbers are: </b>" . $a . " , " . $b . " , " . $c . " , " . $d . " , " . $e . ". <b>Powerball Number is </b>" . $f . ".<br />";
};
为了使其尽可能高效，您不希望每次都必须生成一组新的数字，因此如果出现重复，您只想立即重新选择该字母。
为此，您可以将元素添加到数组中，并在每个字母后搜索它，以确保它是唯一的数字。这是通过使用for循环，while循环和检查变量来完成的。
<?php
for($x = 1; $x < 6; $x++) {
//set each white ball variable (a through e) to a random number between 1 and 69
$uniqueNumbers = array();
$check = true;
$a = floor((lcg_value() * 69 + 1));
array_push($uniqueNumbers, $a);
while ($check) {
$check = false;
$b = floor((lcg_value() * 69 + 1));
foreach ($uniqueNumbers as $element) {
if ($b == $element) {
$check = true;
}
}
}
array_push($uniqueNumbers, $b);
$check = true;
while ($check) {
$check = false;
$c = floor((lcg_value() * 69 + 1));
foreach ($uniqueNumbers as $element) {
if ($c == $element) {
$check = true;
}
}
}
array_push($uniqueNumbers, $c);
$check = true;
while ($check) {
$check = false;
$d = floor((lcg_value() * 69 + 1));
foreach ($uniqueNumbers as $element) {
if ($d == $element) {
$check = true;
}
}
}
array_push($uniqueNumbers, $d);
$check = true;
while ($check) {
$check = false;
$e = floor((lcg_value() * 69 + 1));
foreach ($uniqueNumbers as $element) {
if ($e == $element) {
$check = true;
}
}
}
array_push($uniqueNumbers, $e);
//set powerball number variable to a number between 1 and 26
$f = floor((lcg_value() * 26 + 1));
//echo all white ball numbers and powerball number
echo "<b><u>Set #" . $x . "</u></b> - <b>White ball numbers are: </b>" . $a . " , " . $b . " , " . $c . " , " . $d . " , " . $e . ". <b>Powerball Number is </b>" . $f . ".<br />";
}
以下代码适用于6/49加拿大彩票
<body bgcolor="gold"><font size="9"></font>
<pre>
<?php
// Code by bhupinder Deol . modify according to needs
for ($i=0;$i<=10;$i++) {
for ($x=0;$x<=5;$x++) {
$rand[$x]=rand(1,49);
}
asort($rand);
$result = array_unique($rand);
$count = count($result);
if ($count == 6) {
print_r($rand);
$x=0;
}
else
{
echo "same numbers in array";
--$x;
}
}
?>
</pre>
</body>