PHP loop increment randomly?

Question

We all know the basic

$i = 1;

while ($i<100){
    echo $i;
    $i++
}

Question: How do I increment $i by a random number between 1 and 5 each time it loops?

Answer 1

Exactly like you described it in words: By increment it with a random number between 1 and 5.

while ($i < 1000) {
  echo $i;
  $i += rand(1,5);
}

rand()

Answer 2

In one line:

for ($i = 1; $i < 1000; $i += rand(1, 5)) echo $i;

Answer 3

mt_rand is faster and uses uses the Mersenne Twister algorythm (1997)

while ($i < 1000) {
  echo $i;
  $i += mt_rand(1,5);
}