Need every permutation of capitalized letters in php
php
Solution
This should do it for you:
function permute($word){
if(!$word)
return array($word);
$permutations = array();
foreach(permute(substr($word, 1)) as $permutation){
$lower = strtolower($word[0]);
$permutations[] = $lower . $permutation;
$upper = strtoupper($word[0]);
if($upper !== $lower)
$permutations[] = $upper . $permutation;
}
return $permutations;
}
Codepad Demo
However, for your particular use case there may be a better solution. As there are `2^n` permutations for a string of length `n`. It will be infeasible to run this (or even to generate all those strings using any method at all) on a much longer string.
In reality you should probably be converting strings to one particular case before hashing them, before storing them in the database, if you want to do case-insensitive matching.
Problem
I want to build an array in php that contains every possible capitalization permutation of a word. so it would be (pseudocode) ``` function permutate($word){ for ($i=0; $i<count($word); $i++){ ...confused here... array_push($myArray, $newWord) } return $myArray; } ``` So say I put in "School" I should get an array back of {school, School, sChool, SCHool, schOOl, ... SCHOOL} I know of functions that capitalize the string or the first character, but I am really struggling with how to accomplish this.