将相似的字符串值组合成唯一的

Question

我正在从 Wordpress CPT 中获取一个 post 元数据，它会单独返回多个字符串形式而不是数组，如下所示：

$data = $calendar->data();
foreach ($data as $event) { 
    $days = get_post_meta( $event->ID, 'sp_day', true );
    var_dump($days);
}

string(1) "1" string(1) "1" string(1) "1" string(1) "1" string(1) "1" string(1) "1" string(1) "2" string(1) "2" string(1) "2" string(1) "2" string(1) "2" string(1) "2" string(1) "3" string(1) "3" string(1) "3" string(1) "3" string(1) "3" string(1) "3" string(1) "4" string(1) "4" string(1) "4" string(1) "4" string(1) "4" string(1) "4" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) ""

我尝试将其转换成数组，如 $days = array(get_post_meta( $event->ID, 'sp_day', true )); 转储值是：

array(1) { [0]=> string(1) "1" } array(1) { [0]=> string(1) "1" } array(1) { [0]=> string(1) "1" } array(1) { [0]=> string(1) "1" } array(1) { [0]=> string(1) "1" } array(1) { [0]=> string(1) "1" } array(1) { [0]=> string(1) "2" } array(1) { [0]=> string(1) "2" } array(1) { [0]=> string(1) "2" } array(1) { [0]=> string(1) "2" } array(1) { [0]=> string(1) "2" } array(1) { [0]=> string(1) "2" } array(1) { [0]=> string(1) "3" } array(1) { [0]=> string(1) "3" } array(1) { [0]=> string(1) "3" } array(1) { [0]=> string(1) "3" } array(1) { [0]=> string(1) "3" } array(1) { [0]=> string(1) "3" } array(1) { [0]=> string(1) "4" } array(1) { [0]=> string(1) "4" } array(1) { [0]=> string(1) "4" } array(1) { [0]=> string(1) "4" } array(1) { [0]=> string(1) "4" } array(1) { [0]=> string(1) "4" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" }

比我尝试了 array_merge() 和 array_unique()

None 以上步骤已解决问题。如您所见，我们多次重复值，而不是我希望它们是唯一的，以便每个值仅获得一次，例如“1、2、3、4、5 等”

非常感谢您的建议

Answer 1

你可以在 for 循环之前添加一个空数组，在 for 循环内部你可以检查数组中是否存在该项目，如果不存在则将项目添加到数组中。

$data = $calendar->data();
$result = [];
foreach ($data as $event) { 
    $days = get_post_meta( $event->ID, 'sp_day', true );
    if(! in_array($days, $result)) {
        $result[] = $days;
    }

    
}
var_dump($result);

将相似的字符串值组合成唯一的

Combine Similar Strings Value into Unique One

php

arrays

string

wordpress

post-meta