- str_replace: documentation ( source)
<?php
function removeRepeatedCharacters($key){
$removeNext = false;
for($i = 0; $i < strlen($key); $i++){
if($key[$i] == $key[$i+1]){
$key[$i] = ' ';
$removeNext = true;
} else if($removeNext){
$key[$i] =' ';
$removeNext= false;
}
}
echo str_replace(' ','',$key);
}
removeRepeatedCharacters('aabcccdee');