如何使用 php 从数字范围内随机用“-”替换数字

Question

This is my sample data. i want to replace 2 number from this range randomly.

1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10,

i trying this code.

<?php
for ($i=1; $i <= $noof_q; $i++){
    for ($j=0; $j < $max_range; $j+=$increment){
        echo $min_range+$j.", ";
    }
    if ($j==$max_range) {
         echo "<br>";
    }
}
?>

Answer 1

hope, this code help you

$firstRand = [rand(1, 10), rand(1, 10)];
$secondRand = [rand(1, 10), rand(1, 10)];

for ($i=1; $i < 11; $i++) {
    for ($j=1; $j < 11; $j++) {
        $myNumber = $j;

        if (
            $i === $firstRand[0] && $j === $firstRand[1] || 
            $i === $secondRand[0] && $j === $secondRand[1]
        ) {
            $myNumber = '-';
        }

        echo $myNumber . ", ";

        if ($j == 10) {
            echo "<br>";
        }
    }
}

Answer 2

Create an array in the range from 1 to 10, pick 2 random keys and replace them with the desired string:

<?php
$replaceString = '--';
for($x=1; $x<=5; $x++) {
    $range = range(1,10);
    $randomKeys = array_rand($range, 2);
    $range[$randomKeys[0]] = $replaceString;
    $range[$randomKeys[1]] = $replaceString;
    echo implode(',', $range);
    echo '<br>';
}