letras-de-cadena.php

<?php
/*
	Cadena a arreglo en PHP: separar todas las letras

	https://parzibyte.me/blog
*/
$cadena = "http://parzibyte.me/blog";
$arreglo = str_split($cadena);
var_dump($arreglo);
/*
Salida:
array(24) {
  [0]=>
  string(1) "h"
  [1]=>
  string(1) "t"
  [2]=>
  string(1) "t"
  [3]=>
  string(1) "p"
  [4]=>
  string(1) ":"
  [5]=>
  string(1) "/"
  [6]=>
  string(1) "/"
  [7]=>
  string(1) "p"
  [8]=>
  string(1) "a"
  [9]=>
  string(1) "r"
  [10]=>
  string(1) "z"
  [11]=>
  string(1) "i"
  [12]=>
  string(1) "b"
  [13]=>
  string(1) "y"
  [14]=>
  string(1) "t"
  [15]=>
  string(1) "e"
  [16]=>
  string(1) "."
  [17]=>
  string(1) "m"
  [18]=>
  string(1) "e"
  [19]=>
  string(1) "/"
  [20]=>
  string(1) "b"
  [21]=>
  string(1) "l"
  [22]=>
  string(1) "o"
  [23]=>
  string(1) "g"
}
*/