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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"];
$count = count($data);
for ($i = 0; $i < $count; $i++) {
if ($data[$i] == $data[$i+1]) {
$result[$data[$i]]++;
} else {
$result[$data[$i+1]]++;
}
}
print_r($result);