array_unique in php with array in array

Question

如何为这个数组使用 array_unique 函数 `

$mon  = array('9:00AM - 11:00AM','1:00pm-6pm');
$tue  = array('8:00AM - 11:00AM','12:00pm-6pm');
$wed  = array('9:00AM - 11:00AM','1:00pm-6pm');
$thu  = array('9:00AM - 11:00AM','1:00pm-6pm');
$fri  = array('9:00AM - 12:00PM','1:00pm-6pm');
$sat  = array('9:00AM - 7:00PM');
$sun  = array('9:00AM - 12:00AM','1:00pm-6pm');

$a=array($mon , $tue , $wed , $thu , $fri , $sat , $sun);
print_r(array_unique($a));

Answer 1

您必须为多维数组编写自定义函数，请参考以下函数

function unique_multidim_array($array, $key){
$temp_array = array();
$i = 0;
$key_array = array();

foreach($array as $val){
    if(!in_array($val[$key],$key_array)){
        $key_array[$i] = $val[$key];
        $temp_array[$i] = $val;
    }
    $i++;
}
return $temp_array; }

现在，从您的代码中的任意位置调用此函数

 $details = unique_multidim_array($details,'id');

如果你的情况必须像 0 或 1 一样传递密钥

$a=unique_multidim_array($a,0);

Answer 2

您也可以使用此解决方案：

$schedule = array(
    array('9:00AM - 11:00AM','1:00pm-6pm'),
    array('8:00AM - 11:00AM','12:00pm-6pm'),
    array('9:00AM - 11:00AM','1:00pm-6pm'),
    array('9:00AM - 11:00AM','1:00pm-6pm'),
    array('9:00AM - 12:00PM','1:00pm-6pm'),
    array('9:00AM - 7:00PM'),
    array('9:00AM - 12:00AM','1:00pm-6pm'),
);

$schedule = array_map(function ($item) {
    return json_encode($item);
}, $schedule);

// use array_flip to switch keys and values. By doing it the duplicates will be removed    
$json = '[' . implode(',', array_keys(array_flip($schedule))) . ']';
$schedule = json_decode($json);

var_dump($schedule);

Answer 3

对于 array_unique()，PHP 手册 PHP manual 说

Two elements are considered equal if and only if (string) $elem1 === (string) $elem2 i.e. when the string representation is the same, the first element will be used

所以在内部，输入数组的每个元素在比较之前都被转换为字符串。当您将子数组作为元素时，将它们转换为字符串将输出“数组到字符串转换”通知和 return 无用的结果：

var_dump((string)['foo', 'bar']); // string(5) "Array"

幸运的是，构建 array_unique() 的替代品很容易：

function uniquify(array $arr) {
    return array_reduce(
        $arr,
        function ($carry, $item) {
            if (!in_array($item, $carry)) {
                $carry[] = $item;
            }
            return $carry;
        },
        []
    );
}

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