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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
$arr = array(2, 2, 3, 3, 4, 4, 5, 5, 6);
$res = [];
foreach($arr as $val) {
$res[$val] = ($res[$val] ?? 0) + 1;
}
$max_used = current($res);
print_r($res);
print_r($max_used);