array_unique - codeigniter

Question

$skillsarray = ["php","java","ios","php","php","php","php","java","java","ios"];
$cityarray = ["Chennai","Theni","Theni","Mumbai","Chennai","Theni","Chennai","Hyderabad","Theni","Madurai"];

如果我用array_unique代替$skillsarray，得到的结果为

["php","java"、"ios")

如果我用array_unique代替$cityarray，得到的结果为

{"0":"奈","1":"那时我","3":"孟买","7":"海德拉巴","9":"马杜赖"}

谁能解释为什么array_unique($cityarray)产生字典结果?

Answer 1

array_unique从具有id的数组中查找第一个唯一值，这就是$cityarry与$skillarray不同的原因。请检查图像，将容易理解…:)