Try something like this:
$max_index = null;
$max_value = 0;
foreach($DoctorEducation as $key => $array){
if($array['degree_type_id'] > $max_value){
$max_value = $array['degree_type_id'];
$max_index = $key;
}
}
print_r($DoctorEducation[$max_index]);
This gives you the index and the value of the key with the highest degree_type_id
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solved find max value of a key in array