生成范围内不连续的随机数

Question

I have the following code

<?php
function randomGen($min, $max, $quantity) {
    $numbers = range($min, $max);
    shuffle($numbers);
    $tmp = array_slice($numbers, 0, $quantity);
    //sort($tmp);
    return $tmp;
}
echo '<pre>';
$arr = randomGen(2,7,5);
//sort($arr);}
print_r($arr);

This code generates random n numbers between the specified range.

However, it returns the output similar to the following many times

Array
(
    [0] => 3
    [1] => 4
    [2] => 7
    [3] => 5
    [4] => 2
)

Here, 2 3 4 5 are consecutive numbers. I am trying to modify the above code so that it does not return more than 3 consecutive numbers. The output should be similar to this

Array
(
    [0] => 2
    [1] => 3
    [2] => 5
    [3] => 6
    [4] => 7
)

As you can see, it has just 3 consecutive numbers 5 6 7.

I have tried the following

<?php

function randomGen($min, $max, $quantity) {
    $numbers = range($min, $max);
    shuffle($numbers);
    $tmp = array_slice($numbers, 0, $quantity);
    sort($tmp);
    return $tmp;
}
echo '<pre>';
$arr = randomGen(2,7,5);
$count = 0;
$first = $arr[0];
$i = 1;
//for($i = 1; $i < count($arr); $i++) {
while ($i < count($arr)) {
    $ele = $arr[$i];
    if ($counter >=3) {
        $counter = 0;
        $arr = randomGen(2,7,5);
        $first = $arr[0];
        $i = 1;
    }
    else {
    if ($ele - $first === 1) {
        $counter++;

        //continue;
    }

    $first = $ele;
}
$i++;
}
print_r($arr);

But it doesn't provide the expected output.

Thanks in advance for any help.

Answer 1

Please see if we can do something like this

function randomGen($min, $max, $quantity,$rangestep) {
    $numbers = range($min, $max,$rangestep);

    $tmp = array_slice($numbers, 0, $quantity);
    sort($tmp);
    shuffle($tmp);
    return $tmp;
}
echo '<pre>';
$arr = randomGen(2,7,5,1);
$count = 0;
$first = $arr[0];
$i = 1;
//for($i = 1; $i < count($arr); $i++) {
$counter = 0;
while ($i < count($arr)) {
  $ele = $arr[$i];
  if ($counter >=3) {
    $counter = 0;
    $arr = randomGen(2,7,8,2);
    $first = $arr[0];
    $i = 1;
  }
   else {
   if ($ele - $first === 1) {
      $counter++;

      //continue;
   }
  $first = $ele;
  }
 $i++;
 } 
  print_r($arr);
 die;