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Using PHP 5.5 Generators to simulate an array with duplicate keys
function duplicateKeys($string) {
$string = strtolower($string);
$length = strlen($string);
for ($i = 0; $i < $length; ++$i) {
yield ord(strpos($string, $string[$i])) => $string[$i];
foreach (duplicateKeys('badass') as $i => $value) {
echo $i , ' -> ' , $value, PHP_EOL;
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