按条件生成随机值

Question

我有一个数组：$themes = ['class-A', 'class-B','class-C','class-D','class-E','class-F']我有以下条件：我需要从中生成 12 个类：A 类将只发生一次或不发生。B 类将出现 3 或 6 次。C 类或 D 类没有限制，可以出现多次。E 类将恰好发生两次或不发生。F 类将只发生一次或不发生。我怎样才能做到这一点？谢谢！

Answer 1

另一种可能的实现

<?php

$classAPossibleOccuences = [0,1];

$classARandomChosenOccurence = $classAPossibleOccuences[array_rand($classAPossibleOccuences)];

$classBPossibleOccuences = [3,6];

$classBRandomChosenOccurence = $classBPossibleOccuences[array_rand($classBPossibleOccuences)];

$classEPossibleOccuences = [0,2];

$classERandomChosenOccurence = $classEPossibleOccuences[array_rand($classEPossibleOccuences)];

$classFPossibleOccuences = [0,1];

$classFRandomChosenOccurence = $classFPossibleOccuences[array_rand($classFPossibleOccuences)];

$generatedRandomClassesArr = [];

if($classARandomChosenOccurence) {

  $generatedRandomClassesArr[] = 'class-A';

}

if($classFRandomChosenOccurence) {

  $generatedRandomClassesArr[] = 'class-F';

}

for($i = 0; $i < $classBRandomChosenOccurence; $i++) {

  $generatedRandomClassesArr[] = 'class-B';

}

if($classERandomChosenOccurence) {

  for($i = 0; $i < $classERandomChosenOccurence; $i++) {

    $generatedRandomClassesArr[] = 'class-E';

  }

}

while(sizeof($generatedRandomClassesArr) < 12) {

  $randomCOrD = ['C','D'];

  $randomClass = $randomCOrD[array_rand($randomCOrD)];

  $generatedRandomClassesArr[] = 'class-' . $randomClass;

}

//randomize array elements

shuffle($generatedRandomClassesArr);

highlight_string("<?php\n\$generatedRandomClassesArr =\n" . var_export($generatedRandomClassesArr, true) . ";\n?>");

echo '<br><br>';

highlight_string("<?php\n\$countValues =\n" . var_export(array_count_values($generatedRandomClassesArr), true) . ";\n?>");

?>

检查工作演示

Answer 2

我在这里实现了一个工作演示，它必须满足你的所有规则

<?php

$randomClassesArr = [];

while (sizeof($randomClassesArr) <= 12) {

  $letter = chr(rand(65,70));

  $classLetter = 'class-' . $letter;

  if($letter === 'A' || $letter === 'F') {

    if(!in_array($classLetter, $randomClassesArr)) {

      $randomClassesArr[] = $classLetter;

    } 

  } elseif($letter === 'B') {

    $occurences = array_count_values($randomClassesArr);

    $classBOccurence = $occurences[$classLetter] ?? 0;

    if($classBOccurence !== 3) {

      $randomClassesArr[] = $classLetter;

    }

  } elseif($letter === 'E') {

    $occurences = array_count_values($randomClassesArr);

    $classEOccurence = $occurences[$classLetter] ?? 0;

    if($classEOccurence !== 2) {

      $randomClassesArr[] = $classLetter;

    }

  } else {

    $randomClassesArr[] = $classLetter;

  }

}

highlight_string("<?php\n\$randomClassesArr =\n" . var_export($randomClassesArr, true) . ";\n?>");

echo '<br><br>';

highlight_string("<?php\n\$countValues =\n" . var_export(array_count_values($randomClassesArr), true) . ";\n?>");

?>

在此处查看工作演示，并随时在其之上进行编辑。