How do you print an alphabetical ordered array of letters from a to z in php?

I made a constant time function as follows

This function gives the Alphabetic representation of a numeric index

public static $alpha = ['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'];

public static function getColName($index){
  $index--;
  $nAlphabets = 26;
  $f = floor($index/pow($nAlphabets,0)) % $nAlphabets;
  $s = (floor($index/pow($nAlphabets,1)) % $nAlphabets)-1;
  $t = (floor($index/pow($nAlphabets,2)) % $nAlphabets)-1;

  $f = $f < 0 ? '' : self::$alpha[$f];
  $s = $s < 0 ? '' : self::$alpha[$s];
  $t = $t < 0 ? '' : self::$alpha[$t];

  return trim("{$t}{$s}{$f}");

}

Now if you want to use it create a range. you can call this function in a loop pushing your values to an array.

As for most of the time, we need the representation rather than a range this function would work just fine.

HOW TO USE

Just enclose these static functions in a class and use it as

className::getColName(47);

Making a range in my case was a waste of memory.

All alphabetic characters in an array can be achieved by using chr(), range() with for and foreach loop in PHP. To display the array elements as output we can use echo, print_r() and var_dump() function.

Using range() function: This function is used to create an array of elements of any kind such as integer, alphabets within a given range (from low to high) i.e, the first element of list is considered as low and last one is considered as high. It returns an array of alphabets if the range from A to Z i.e. range(A, Z).

Syntax:

array range( mixed first, mixed second, number steps )

Example 1: Below example illustrate how to display an array of all alphabetic character using range() function.

foreach( range('A', 'Z') as $elements) {

    echo $elements . ", ";

}

?>

Output:

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,

Example 2: Below example illustrate how to display an array of all Alphabetic character using range() function along with array_combine.

$alphachar = array_merge(range('A', 'Z'), range('a', 'z'));

foreach ($alphachar as $element) {

    echo $element . " ";

}

?>

Output:

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
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

Using chr() function: The chr() function is used to convert an ASCII value to a character. It accepts an ASCII value as a parameter and returns a string representing a character from the specified ASCII value. The ASCII value can be specified in decimal, octal, or hex values. It returns an array of alphabet if the chr() has its ASCII values from 65 to 91 for alphabet.

Syntax:

string chr( <>int $value )

Example 1: Below example illustrate to display an array of all Alphabetic character using ASCII values.

$array = Array();

for( $i = 65; $i < 91; $i++) {

        $array[] = chr($i);

}

foreach( $array as $k => $v) {

    echo $k . " => " . $v . ", ";

}

?>

Output:

0 => A, 1 => B, 2 => C, 3 => D, 4 => E, 5 => F, 6 => G, 7 => H,
8 => I, 9 => J, 10 => K, 11 => L, 12 => M, 13 => N, 14 => O,
15 => P, 16 => Q, 17 => R, 18 => S, 19 => T, 20 => U, 21 => V,
22 => W, 23 => X, 24 => Y, 25 => Z,

Example 2: Below example illustrate to display an array of all Alphabetic character using ASCII values with the help of chr() function.

for( $x = 65; $x <= 90; $x++) {

    echo $x . " => " . chr($x) . ", ";

}

?>

Output:

65 => A, 66 => B, 67 => C, 68 => D, 69 => E, 70 => F, 71 => G,
72 => H, 73 => I, 74 => J, 75 => K, 76 => L, 77 => M, 78 => N,
79 => O, 80 => P, 81 => Q, 82 => R, 83 => S, 84 => T, 85 => U,
86 => V, 87 => W, 88 => X, 89 => Y, 90 => Z,