php中实现数组去重的函数

<?php

$input = ['you are' => 666, 'i am' => 233, 'he is' => 233, 'she is' => 666];

$result = array_unique($input);

var_dump($result);

// 结果 ['you are' => 666, 'i am' => 233]

<?php

$input = ['you are' => 666, 'i am' => 233, 'he is' => 233, 'she is' => 666];

$result = array_flip(array_flip($input));

var_dump($result);

// 结果 ['she is' => 666, 'he is' => 233]