array_unique - php - codeigniter

Question

$skillsarray = ["php","java","ios","php","php","php","php","java","java","ios"];

$cityarray = ["Chennai","Theni","Theni","Mumbai","Chennai","Theni","Chennai","Hyderabad","Theni","Madurai"];

如果我将array_unique用于$skillsarray，请将结果设为

  

[ “PHP”， “Java” 的， “IOS”]

如果我将array_unique用于$cityarray，请将结果设为

  

{ “0”： “奈”， “1”： “与Theni”， “3”： “孟买”， “7”： “海得拉巴”， “9”： “马杜赖”}

有人能解释为什么array_unique($cityarray)正在产生字典结果吗？

Answer 1

array_unique find first unique values from the array with id and that is the reason $cityarry is different from $skillarray. Please check image that will easy to understand...:)