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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
$data = ["a", "a", "a", "b", "b", "c", "c", "a", "a", "a"];
$countedValues = array_count_values($data);
foreach ($countedValues as $symbol => $num) {
$result .= $symbol . $num;
}
echo $result;