'Converting alphabet letter to alphabet position in PHP [duplicate]

$my_alphabet = "T";

The above character "T" should print the exact position/number of the alphabet. i.e 20

So, if

$my_alphabet = "A" ;
  • I should be able to get the position of the alphabet. i.e. 1

How can I achieve that.

I see converting number to alphabet .. but the reverse is not there anywhere.

php


Solution 1:[1]

By using the ascii value:

ord(strtoupper($letterOfAlphabet)) - ord('A') + 1

in ASCII the letters are sorted by alphabetic order, so...

Solution 2:[2]

you should be careful about (uppercase, lowercase):

<?php
$upperArr = range('A', 'Z') ;
$LowerArr = range('a', 'z') ;
$myLetter = 't';

if(ctype_upper($myLetter)){
    echo (array_search($myLetter, $upperArr) + 1); 
}else{
    echo (array_search($myLetter, $LowerArr) + 1); 
}
?>

Solution 3:[3]

In case the alphabet letter is not upper case, you can add this line of code to make sure you get the right position of the letter 

$my_alphabet = strtoupper($my_alphabet);

so if you get either 'T' or 't', it will always return the right position.

Otherwise @bwoebi's answers will perfectly do the job

Solution 4:[4]

if you use upper case and lower case use this function to get the right position

function offset(string $char): int {
  $abcUpper = range('A', 'Z');
  $abcLower = range('a', 'z');
  if (ctype_upper($char)) return array_search($char, $abcUpper) + 1;
  else return array_search($char, $abcLower) + 1;
}

test

echo offset("a"); // 1

if you use an array and you want to get the position to use in an array

function offset(string $char): int {
  $abcUpper = range('A', 'Z');
  $abcLower = range('a', 'z');
  if (ctype_upper($char)) return array_search($char, $abcUpper);
  else return array_search($char, $abcLower);
}

test

echo offset("a"); // 0

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 schellingerht
Solution 2 Mohammad Alabed
Solution 3 Community
Solution 4 Aly Ahmed Aly

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