我有一个大型多维数组,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 )
)我希望能够用多个过滤器过滤这个数组。
例如:筛选类别= cat1和type = blah1将返回数组1和3。
下面的函数将返回键1,2,3,这是不正确的,因为数组2没有cat1和blah1
有人能看到我需要做些什么才能让这件事奏效吗?
如果是这样的话,是否有可能将索尔丁纳入这一功能?
function array_searcher($needles, $array) {
foreach ($needles as $needle) {
foreach ($array as $key => $value) {
foreach ($value as $v) {
if ($v == $needle) {
$keys[] = $key;
}
}
}
}
return $keys;
}发布于 2014-01-23 21:48:55
我决定重写我的答案,以适应过滤和排序。我采用了一种非常面向对象的方法来解决这个问题,我将在下面详细介绍。
您可以在这个ideone.com live demonstration上看到所有这些代码都在运行。
我做的第一件事是定义了两个接口。
interface Filter {
public function filter($item);
}
interface Comparator {
public function compare($a, $b);
}顾名思义,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。这个类简单地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);
}
}您可以指定一个排序方向,以及要对每个元素进行比较之前进行的转换。我定义了一个helped类来封装我的SortDirection值。
class SortDirection {
const Ascending = 1;
const Descending = -1;
}接下来,我定义了MultipleKeyComparator,它接受多个KeyComparator实例,并使用它们来比较两个数组。将它们添加到MultipleKeyComparator中的顺序是优先级的顺序。
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,用于基于键/值对的数组过滤数组:
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,为了使排序变得明显,我对它们进行了一些重新排列):
$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);可以通过执行以下操作来实现过滤:
$filter = new MultipleKeyValueFilter(array(
'type' => 'blah1'
));
echo "Filtered by multiple fields\n";
print_r(array_filter($array, array($filter, 'filter')));在这一点上,我给了您大量的代码。我建议您的下一步是将这两部分合并成一个类。然后,这个单独的类将同时应用过滤和排序。
发布于 2014-01-23 21:53:06
做:
$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($out);
echo '</pre>';
// output
Array
(
[1] => Array
(
[type] => blah1
[category] => cat1
[exp_range] => this_week
)
[3] => Array
(
[type] => blah1
[category] => cat1
[exp_range] => this_week
)
)发布于 2014-01-23 21:53:12
问题在于,您的函数将返回每个包含"cat1“或"blah1”的数组的键。您可以使用array_unique()修复它:
function array_searcher($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);https://stackoverflow.com/questions/21319729
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