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<?php
$arr = array('a012','a023','a034','a010','a221','a133','a000','a111','a222');
$arrcount = array();
foreach($arr as $val){
$tmp = array_count_values(str_split($val));
$arrcount[$val] = max($tmp);
}
print_r($arrcount);
?>
$a = array(
'a012',
'a023',
'a034',
'a010',
'a221',
'a133',
'a000',
'a111',
'a222',
);
foreach($a as $v) {
$t = array_count_values(str_split($v));
$res[$v] = max($t);
}
print_r($res);
Array
(
[a012] => 1
[a023] => 1
[a034] => 1
[a010] => 2
[a221] => 2
[a133] => 2
[a000] => 3
[a111] => 3
[a222] => 3
)