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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
$arr = [1=>1,2=>2,3=>3,4=>4,4=>5,4=>6,5=>7,6=>8,7=>9,8=>10,9=>11,9=>12,9=>13];
// Считаем количество значений
$count_values = array_count_values($arr);
print_r($count_values);
// Фильтруем те котовых больше 1
$repits = array_filter($count_values, fn($el) => $el > 1);
print_r($repits);