Question

我有这个巨大的阵列：

array(47) (
    "name" => string(0) ""
    "state" => string(7) "Alabama"
    "city" => string(0) ""
    "country" => string(13) "United States"
    "location" => string(0) ""
    "rooms" => string(0) ""
    "price" => string(0) ""
    "highlights" => array(5) (
        0 => string(0) ""
        1 => string(0) ""
        2 => string(0) ""
        3 => string(0) ""
        4 => string(0) ""
    )
    "specifications_type" => string(0) ""
    "specifications_lotsize" => string(0) ""
    "specifications_apn" => string(0) ""
    "specifications_interest" => string(0) ""
    "specifications_year" => string(0) ""
    "specifications_buildings" => string(0) ""
    "specifications_stories" => string(0) ""
    "specifications_corridors" => string(0) ""
    "financials_room" => string(0) ""
    "financials_other" => string(0) ""
    "financials_total" => string(0) ""
    "financials_multiplier" => string(0) ""
    "financials_caprate" => string(0) ""
    "financials_netincome" => string(0) ""
    "amenities_pool" => string(0) ""
    "amenities_fitness" => string(0) ""
    "amenities_quarters" => string(0) ""
    "amenities_services" => string(0) ""
    "amenities_spa" => string(0) ""
    "amenities_meetspace" => string(0) ""
    "amenities_parkspace" => string(0) ""
    "amenities_others" => string(0) ""
    "facilities_room" => string(0) ""
    "facilities_hvac" => string(0) ""
    "facilities_furnitures" => string(0) ""
    "facilities_tv" => string(0) ""
    "facilities_ref" => string(0) ""
    "facilities_microwave" => string(0) ""
    "consumables_resto" => string(0) ""
    "consumables_restocpct" => string(0) ""
    "consumables_barlounge" => string(0) ""
    "consumables_barloungecpct" => string(0) ""
    "consumables_bevrevenue" => string(0) ""
    "consumables_others" => string(0) ""
    "specifications" => string(100) "{"type":"","lotsize":"","apn":"","interest":"","year":"","buildings":"","stories":"","corridors":""}"
    "consumables" => string(89) "{"resto":"","restocpct":"","barlounge":"","barloungecpct":"","bevrevenue":"","others":""}"
    "amenities" => string(100) "{"type":"","lotsize":"","apn":"","interest":"","year":"","buildings":"","stories":"","corridors":""}"
    "facilities" => string(100) "{"type":"","lotsize":"","apn":"","interest":"","year":"","buildings":"","stories":"","corridors":""}"
    "financials" => string(100) "{"type":"","lotsize":"","apn":"","interest":"","year":"","buildings":"","stories":"","corridors":""}"
)

我想删除其键以下列任何一项开头的元素： “specifications_”，“amenities_”，“facilities_”，“consumables_”，“财务_”

我曾想过将array_filter与回调一起使用，但我不知道如何在回调中做事。请帮忙。

Answer 1

您实际上无法使用array_filter()，因为它会保留密钥，但您无法过滤密钥，这是您的问题。在这种情况下，你也可以循环。

$prefix = array(
  'specifications_',
  'amenities_',
  'facilities_',
  'consumables_',
  'financials_',
);

$output = array();
foreach ($input as $k => $v) {
  foreach ($prefix as $p) {
    $add = true;
    if (strpos($k, $p) === 0) {
      $add = false;
      break;
    }
  }
  if ($add) {
    $output[$k] = $v;
  }
}

现在只要前缀列表不那么大且数组不是那么大，但是除非你需要它，否则不需要使解决方案过于复杂。

Answer 2

array_filter()仅传递值，因此不适合此任务。使用foreach()遍历数组，将要保留的元素添加到新数组中。

Answer 3

<?php
    $source_array = array([..the yours array..]);
    $temp_array = array();
    $exclude_keys = array('specifications', 'amenities', 'facilities', 'consumables', 'financials');
    foreach ($source_array as $key => $value) {
        if (!in_array(substr($key, 0, strpos('_') - 1), $exclude_keys)) {
            $temp_array[$key] = $value;
        }
    }

Answer 4

array_walk怎么办？

$prefix = array(
  'specifications_',
  'amenities_',
  'facilities_',
  'consumables_',
  'financials_',
);

function filter($v, $k, &$data) {
    global $prefix;
    foreach($prefix as $p) {
        if(strpos($v, $p) === 0) {
            unset($data[$v])
            break;
        }
    }
}

array_walk(array_keys($array), 'filter', &$array);

请注意，我遍历数组的键。这是因为不允许更改用于array_walk的数组（或者至少会导致不可预测的行为）。

如果要保持原始数组的完整性，则必须先复制它：

$array_copy = $array;    
array_walk(array_keys($array), 'filter', &$array_copy);

如何使用等于PHP中某个单词的键删除数组元素？

4 个答案: