Php array key value get

- Php if array key exists get value
- Php get first array key value
- Php array get specific key value
- Php array get last key value
- Php get array key by value multidimensional
- Php array get max value key
- Php array get value without key
- Php array get value by key name
- Php associative array get key value
- Php array_map get key and value
- Php get array key by object value
- Php get array element by key value
- Php get array index by key value
- Php get array key with highest value
- Php json array get value by key