搜索PHP数组值并显示它们(如果存在

Question

我有两个页面，一个HTML页面和一个PHP页面。HTML包含一个表单，该表单要求用户键入城市名称以及如何对其进行排序(无、升序或降序)。PHP页面接收输入并包含一个城市数组。我的问题是:如果输入包含字符串的一部分，我如何显示数组中存在的值(使用循环)？例如:如果我搜索"De"，它应该返回底特律和迪尔伯恩，并根据我的选择对它们进行排序。

php代码如下：

<?php
        $sort = substr(filter_input(INPUT_GET, 'sort', FILTER_SANITIZE_STRING),0,4);
        $city = substr(filter_input(INPUT_GET, 'city', FILTER_SANITIZE_STRING),0,20);
          $cities[0] = "Detroit, Michigan";
          $cities[1] = "Rome, Italy";
          $cities[2] = "New York, New York";
          $cities[3] = "Austin, Texas";
          $cities[4] = "Atlanta, Georgia";
          $cities[5] = "Dubai, UAE";
          $cities[6] = "Shanghai, China";
          $cities[7] = "Mumbai, India";
          $cities[8] = "Windsor, Canada";
          $cities[9] = "Los Angeles, California";
          $cities[10] = "Chicago, Illinois";
          $cities[11] = "London, England";
          $cities[12] = "Dearborn, Michigan";
          $cities[13] = "Istanbul, Turkey";
          $cities[14] = "Pittsburgh, Pennsylvania";
          $cities[15] = "Cincinnati, Ohio";
          $cities[16] = "Anaheim, California";
          $cities[17] = "Orlando, Florida";
          $cities[18] = "Dallas, Texas";
          $cities[19] = "Hong Kong, China";
          $cities[20] = "Cairo, Egypt";
?>

Answer 1

带fnmatch()检查的array_filter()似乎是一种合乎逻辑的方法：

$matches = array_filter(
    $cities,
    function($value) use ($city) {
        return fnmatch('*'.$city.'*', $value, FNM_CASEFOLD);
    }
);

编辑

解释一下。array_filter()针对数组($cities)中的每个值执行回调，该回调返回一个布尔值true/false，以指示是否应该接受或丢弃该值。回调使用fnmatch()函数对数组条目值和搜索值执行通配符比较；如果值匹配，则返回true；否则返回false。

结果；$matches数组只包含那些符合搜索条件的条目。

Demo

如果要对结果($matches)进行排序，则在运行该过滤器后对其进行排序

Answer 2

首先，你可以用array_filter过滤你的城市。

$filtered = array_filter($cities, function($current) use ($city) {
    // If the current city start with our input, we keep it.
    return stripos($current, $city) === 0;
});

其次，您可以使用sort rsort根据顺序对您的城市进行排序。

if ($sort === 'ASC') {
    sort($filtered);
} elseif ($sort === 'DESC') {
    rsort($filtered);
}

然后，您只需返回经过筛选和排序的结果。

Answer 3

您可以遍历数组并使用PHP strstr function查找匹配项：

$matches = array();
foreach ($cities as $city) {
    if (strstr($city, $search)) {
        $matches[] = $city;
    }
}