Printing pattern sequence of 3 characters - php

Question

I would like to print pattern of 3 characters using PHP. Like aaa, aab, aac .... zzz.
Now, I am using these PHP code but it is printing randomly instead sequence.
$i = 1;
$chars = array("a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z");
while($i > 0){ $current = $chars[rand(0,25)].$chars[rand(0,25)].$chars[rand(0,25)]; }

Answer 1

Quick but sloppy
$i=0;
$j=0;
$k=0;
while($i<26){
while($j<26){
while($k<26){
echo $chars[$i] . $chars[$j] . $chars[$k];
$k++;
}
$j++;
$k=0;
}
$i++;
$j=0;
$k=0;
}

Answer 2

Count from 0 to 26^3 -1. Then convert your numbers to base 26 , replace numbers by letters as needed, and prefix with "a" or "aa" if the converted result is single or double digit.
Use this function: string base_convert ( string $number , int $frombase , int $tobase )
I am not going to code it all out for you. You need to learn from it.

Answer 3

I got it in c#.
string sample = "AAA";
char[] chars = sample.ToCharArray();
char first = chars[0];
char second = chars[1];
char third = chars[2];
if (first == second && first == third)
{
third++;
bool isAlphaBet = Regex.IsMatch(third.ToString(), "[a-z]", RegexOptions.IgnoreCase);
if (isAlphaBet)
{
return $"{first}{second}{third}";
}
return $"empty";
}
if (first == second && first != third)
{
third++;
bool isAlphaBet = Regex.IsMatch(third.ToString(), "[a-z]", RegexOptions.IgnoreCase);
if (isAlphaBet)
{
return $"{first}{second}{third}";
}
else
{
second++;
third = 'A';
return $"{first}{second}{third}";
}
}//"ABA";
if (first != second && first == third)
{
third++;
bool isAlphaBet = Regex.IsMatch(third.ToString(), "[a-z]", RegexOptions.IgnoreCase);
if (isAlphaBet)
{
return $"{first}{second}{third}";
}
else
{
second++;
third = 'A';
return $"{first}{second}{third}";
}
}
if (first != second && first != third && second != third)
{
third++;
bool isAlphaBet = Regex.IsMatch(third.ToString(), "[a-z]", RegexOptions.IgnoreCase);
if (isAlphaBet)
{
return $"{first}{second}{third}";
}
else
{
second++;
third = 'A';
bool isAlphaBetSecond = Regex.IsMatch(second.ToString(), "[a-z]", RegexOptions.IgnoreCase);
if (isAlphaBetSecond)
{
return $"{first}{second}{third}";
}
else
{
second = 'A';
first++;
bool isAlphaBetFirst = Regex.IsMatch(first.ToString(), "[a-z]", RegexOptions.IgnoreCase);
if (isAlphaBetFirst)
{
return $"{first}{second}{third}";
}
else
{
return $"empty";
}
}
}
}
if (first != second && second == third)
{
third++;
bool isAlphaBetThird = Regex.IsMatch(third.ToString(), "[a-z]", RegexOptions.IgnoreCase);
if (isAlphaBetThird)
{
return $"{first}{second}{third}";
}
else
{
third = 'A';
second++;
bool isAlphaBetSecond = Regex.IsMatch(second.ToString(), "[a-z]", RegexOptions.IgnoreCase);
if (isAlphaBetSecond)
{
return $"{first}{second}{third}";
}
else
{
second = 'A';
first++;
bool isAlphaBetFirst = Regex.IsMatch(first.ToString(), "[a-z]", RegexOptions.IgnoreCase);
if (isAlphaBetFirst)
{
return $"{first}{second}{third}";
}
else
{
return $"empty";
}
}
}
}
return $"{first}{second}{third}";

Answer 4

If you need to print random - like 'aaa' or 'vvv' or 'ddd' - try to use
$char = $chars[rand(0,25)];
echo $current = $char.$char.$char;
If you want to print 'aaa','bbb','ccc',...- use
for ($i = 0; $i < 26; $i++) {
$char = $chars[$i];
echo $current = $char.$char.$char;
}