我有一个大的多维数组，如下所示：
Array(
[1] => Array ( [type] => blah1 [category] => cat1 [exp_range] => this_week )
[2] => Array ( [type] => blah1 [category] => cat2 [exp_range] => next week )
[3] => Array ( [type] => blah1 [category] => cat1 [exp_range] => next week )
[4] => Array ( [type] => blah2 [category] => cat2 [exp_range] => this_week )
)
我希望能够使用多个过滤器过滤此数组 例如。过滤where category = cat1和type = blah1将返回数组1和3.
我有以下函数会返回键1,2,3这是不正确的，因为数组2没有 cat1 和 blah1
任何人都可以看到我需要做些什么才能让它发挥作用？
也可以在这个函数中加入sortin，如果是这样的话？
function array_searcher($needles, $array) {
foreach ($needles as $needle) {
foreach ($array as $key => $value) {
foreach ($value as $v) {
if ($v == $needle) {
$keys[] = $key;
}
}
}
}
return $keys;
}
答案 0 :(得分：5)
我决定重写我的答案，以适应过滤和排序。我采用了一种面向对象的方法来解决这个问题，我将在下面详细介绍。
您可以在此ideone.com live demonstration上看到所有这些代码。
我做的第一件事是定义两个接口。
interface Filter {
public function filter($item);
}
interface Comparator {
public function compare($a, $b);
}
正如他们的名字所示，Filter用于过滤，Comparator用于比较。
接下来，我定义了三个实现这些接口的具体类，并完成了我想要的。
首先是KeyComparator。该类只是将一个元素的键与另一个元素的键进行比较。
class KeyComparator implements Comparator {
protected $direction;
protected $transform;
protected $key;
public function __construct($key, $direction = SortDirection::Ascending, $transform = null) {
$this->key = $key;
$this->direction = $direction;
$this->transform = $transform;
}
public function compare($a, $b) {
$a = $a[$this->key];
$b = $b[$this->key];
if ($this->transform) {
$a = $this->transform($a);
$b = $this->transform($b);
}
return $a === $b ? 0 : (($a > $b ? 1 : -1) * $this->direction);
}
}
您可以指定排序方向，以及在比较每个元素之前对其进行的转换。我定义了一个帮助类来封装我的SortDirection值。
class SortDirection {
const Ascending = 1;
const Descending = -1;
}
接下来，我定义了MultipleKeyComparator，其中包含多个KeyComparator实例，并使用它们将两个数组相互比较。它们被添加到MultipleKeyComparator的顺序是优先顺序。
class MultipleKeyComparator implements Comparator {
protected $keys;
public function __construct($keys) {
$this->keys = $keys;
}
public function compare($a, $b) {
$result = 0;
foreach ($this->keys as $comparator) {
if ($comparator instanceof KeyComparator) {
$result = $comparator->compare($a, $b);
if ($result !== 0) return $result;
}
}
return $result;
}
}
最后，我创建了MultipleKeyValueFilter，用于根据键/值对数组过滤数组：
class MultipleKeyValueFilter implements Filter {
protected $kvPairs;
public function __construct($kvPairs) {
$this->kvPairs = $kvPairs;
}
public function filter($item) {
$result = true;
foreach ($this->kvPairs as $key => $value) {
if ($item[$key] !== $value)
$result &= false;
}
return $result;
}
}
现在，给定输入数组（注意我重新排列了一些以使排序明显）：
$array = array (
'1' => array ('type' => 'blah2', 'category' => 'cat2', 'exp_range' => 'this_week' ),
'2' => array ('type' => 'blah1', 'category' => 'cat1', 'exp_range' => 'this_week' ),
'3' => array ('type' => 'blah1', 'category' => 'cat2', 'exp_range' => 'next_week' ),
'4' => array ('type' => 'blah1', 'category' => 'cat1', 'exp_range' => 'next_week' )
);
可以通过执行以下操作来实现排序：
$comparator = new MultipleKeyComparator(array(
new KeyComparator('type'),
new KeyComparator('exp_range')
));
usort($array, array($comparator, 'compare'));
echo "Sorted by multiple fields\n";
print_r($array);
通过执行以下操作可以实现过滤：
$filter = new MultipleKeyValueFilter(array(
'type' => 'blah1'
));
echo "Filtered by multiple fields\n";
print_r(array_filter($array, array($filter, 'filter')));
此时我已经为您提供了大量代码。我建议您下一步是将这两部分合并为一个单独的课程。然后，这个单一类将同时应用过滤和排序。
答案 1 :(得分：1)
做到：
$arr = array(
1 => array ( "type" => "blah1", "category" => "cat1", "exp_range" => "this_week" ),
2 => array ( "type" => "blah1", "category" => "cat2", "exp_range" => "next week" ),
3 => array ( "type" => "blah1", "category" => "cat1", "exp_range" => "this_week" ),
4 => array ( "type" => "blah2", "category" => "cat2","exp_range" => "next week" ),
);
function filter(array $arr,array $params){
$out = array();
foreach($arr as $key=>$item){
$diff = array_diff_assoc($item,$params);
if (count($diff)==1) // if count diff == 1 - Ok
$out[$key] = $item;
}
return $out;
}
$out = filter($arr,array("type" => "blah1", "category" => "cat1"));
echo '<pre>';
print_r($out);
echo '</pre>';
// output
Array
(
[1] => Array
(
[type] => blah1
[category] => cat1
[exp_range] => this_week
)
[3] => Array
(
[type] => blah1
[category] => cat1
[exp_range] => this_week
)
)
答案 2 :(得分：1)
问题在于，您的函数将返回包含“cat1”或“blah1”的每个数组的键。您可以使用array_unique（）修复它：
function array_searcher($needles, $array) {
foreach ($needles as $needle) {
foreach ($array as $key => $value) {
foreach ($value as $v) {
if ($v == $needle) {
$keys[] = $key;
}
}
}
}
return $keys;
}
$bigarray = array(
array('type' => 'blah1', 'category' => 'cat1', 'exp_range' => 'this_week'),
array('type' => 'blah1', 'category' => 'cat2', 'exp_range' => 'next week'),
array('type' => 'blah1', 'category' => 'cat1', 'exp_range' => 'next week'),
array('type' => 'blah2', 'category' => 'cat2', 'exp_range' => 'this_week')
);
$result = array_searcher(array('cat1','blah1'), $bigarray);
$unique_result = array_unique($result);
print_r($unique_result);
答案 3 :(得分：1)
所以我们将你的基数组分配给一个变量：
$array = Array(
[1] => Array ( [type] => blah1 [category] => cat1 [exp_range] => this_week )
[2] => Array ( [type] => blah1 [category] => cat2 [exp_range] => next week )
[3] => Array ( [type] => blah1 [category] => cat1 [exp_range] => next week )
[4] => Array ( [type] => blah2 [category] => cat2 [exp_range] => this_week )
)
并让我们有一个包含我们过滤器的数组：
$filter = array(
'type' => 'blah1'
'category' => 'cat1'
)
然后我们开始过滤脚本
foreach ($array as $key => $row){
$i = 0;
foreach ($filter as $filterKey => $filterValue){
if ($row[$filterKey] != $filterValue){
$i++;
}}
if ($i == 0){
$filteredArray[] = $row;
}}
如果在对我们的过滤器测试行之后$ i仍然等于0，我们将该行添加到过滤后的数组
答案 4 :(得分：-1)