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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
$text = 'Rivendell';
$chars = [];
for ($i = 0, $length = strlen($text); $i < $length; ++$i) {
$chars[$text[$i]] ??= $text[$i];
$chars[$text[$i]] .= '*';
}
var_dump(implode(',', $chars));