我想删除重复项，其中测量或altunit与另一个数组匹配，但忽略它们是否为空。
Array
(
[0] => Array
(
[id] => 2
[altunit] => %
[measurement] =>
)
[1] => Array
(
[id] => 3
[altunit] =>
[measurement] => 6
)
[2] => Array
(
[id] => 4
[altunit] => %
[measurement] =>
)
[3] => Array
(
[id] => 5
[altunit] =>
[measurement] => 6
)
[4] => Array
(
[id] => 6
[altunit] =>
[measurement] => 6
)
)
变为
Array
(
[0] => Array
(
[id] => 2
[altunit] => %
[measurement] =>
)
[1] => Array
(
[id] => 3
[altunit] =>
[measurement] => 6
)
)
我能想到的最好的是：
$test = array ( 0 => array ( 'id' => '2', 'altunit' => '%', 'measurement' => NULL, ), 1 => array ( 'id' => '3', 'altunit' => NULL, 'measurement' => '6', ), 2 => array ( 'id' => '4', 'altunit' => NULL, 'measurement' => '6', ), 3 => array ( 'id' => '5', 'altunit' => NULL, 'measurement' => '6', ), 4 => array ( 'id' => '6', 'altunit' => NULL, 'measurement' => '6', ), );
$num = [];
foreach($test as $k => $v) $num[] = $v['measurement'];
但这仅适用于测量，并删除id和altunit键。
答案 0 :(得分：3)
姆， 为测量和altunit创建一个“已知值”数组，然后检查它是否存在于其余值上。
类似的东西：
$knowed_altunit=array();
$knowed_measurement=array();
foreach($test as $k=>$v){
if(in_array($v['altunit'],$knowed_altunit)
|| in_array($v['mesurement'],$knowed_measurement)){
//if the value of altunit or measurement is already knowed then remove the entry from the array,
unset($test[$k]);
}else{
//if it never been seen, add it so further entry can be checked agaisnt the knowed value
$knowed_altunit[]=$v['altunit'];
$knowed_measurement[]=$v['mesurement'];
}
}
很抱歉，如果有任何错字，可能会帮助您解决问题的解决方案。
答案 1 :(得分：2)
您可以尝试以下代码：
<?php
/* before you need to check that $test variable is declarated and have all items to check */
$values_altunit = array();
$values_measurement = array();
$result = array();
foreach($test as $key => $value) {
/* check if exist altunit and measurement values in blacklist arrays */
if (!in_array($value['altunit'], $values_altunit) && !in_array($value['measurement'], $values_measurement)) {
/* if not exist, add the item to $result array */
$result[$key] = $value;
/* and add altunit and measurement values to blacklist arrays */
$values_altunit[] = $value['altunit'];
$values_measurement[] = $value['measurement'];
}
}
/* print result items */
var_dump($result);
?>
答案 2 :(得分：1)
这是一个简短的代码，可以为独特的测量结果提供结果
<?php
$arr = array(
"0"=> array (
"id" => 2,
"altunit" => "%",
"measurement" => "",
),
"1"=> array (
"id" => 3,
"altunit" => "",
"measurement" => 6,
),
"2"=> array (
"id" => 4,
"altunit" => "%",
"measurement" => "",
),
"3"=> array (
"id" => 5,
"altunit" => "",
"measurement" => 6,
),
"4"=> array (
"id" => 6,
"altunit" => "",
"measurement" => 6,
)
);
$unique_measure = $new_array = array();
foreach($arr as $sup_key => $sup_val){
foreach($sup_val as $sub_key => $sub_val){
if(!in_array($sup_val['measurement'], $unique_measure)){
array_push($unique_measure, $sup_val['measurement']);
array_push($new_array,$sup_val);
}
}
}
print_r($new_array);
?>
输出：
Array
(
[0] => Array
(
[id] => 2
[altunit] => %
[measurement] =>
)
[1] => Array
(
[id] => 3
[altunit] =>
[measurement] => 6
)
)
试试这段代码。它可以做到这一点。
您的问题解决方案的另一种方法是使用unset(your_array_key)从主阵列中删除该特定键，将在相同的代码中执行此操作。
答案 3 :(得分：1)
试试，这可能会对你有所帮助
function remove_dup($array, $keys )
{
$out = array();
foreach($array as $sub)
{
if(empty($out))
{
$out[] = $sub;
continue;
}
foreach($keys as $key)
{
if($flag=in_array( $sub[$key],array_map(function($e) use($key){ return $e[$key];}, $out)) )
break;
}
if(!$flag)
$out[] = $sub;
}
return $out;
}
// Usage
print_r( remove_dup($array, array('altunit','measurement') ) );
<强>测试
[akshay@localhost tmp]$ cat test.php
<?php
function remove_dup($array, $keys )
{
$out = array();
foreach($array as $sub)
{
if(empty($out))
{
$out[] = $sub;
continue;
}
foreach($keys as $key)
{
if($flag=in_array( $sub[$key],array_map(function($e) use($key){ return $e[$key];}, $out)) )
break;
}
if(!$flag)
$out[] = $sub;
}
return $out;
}
$array = array(
"0"=> array (
"id" => 2,
"altunit" => "%",
"measurement" => "",
),
"1"=> array (
"id" => 3,
"altunit" => "",
"measurement" => 6,
),
"2"=> array (
"id" => 4,
"altunit" => "%",
"measurement" => "",
),
"3"=> array (
"id" => 5,
"altunit" => "",
"measurement" => 4,
),
"4"=> array (
"id" => 6,
"altunit" => "",
"measurement" => 6,
)
);
print_r( remove_dup($array, array('altunit','measurement') ) );
?>
<强>输出
[akshay@localhost tmp]$ php test.php
Array
(
[0] => Array
(
[id] => 2
[altunit] => %
[measurement] =>
)
[1] => Array
(
[id] => 3
[altunit] =>
[measurement] => 6
)
)
答案 4 :(得分：0)
你真正想要的是设置，而不是数组。因此，如果您无法解决首先构建阵列的方式（我猜这是来自SQL查询，这将是更少的代码来纠正）你有两个用于在PHP中创建映射集的选项。
SplObjectStorage Array将密钥作为第一种方法看起来像这样......
$set = new SplObjectStorage();
$arr = [
0 => [
'id' => '2',
'altunit' => '%',
'measurement' => NULL,
],
1 => [
'id' => '3',
'altunit' => NULL,
'measurement' => '6',
],
2 => [
'id' => '4',
'altunit' => NULL,
'measurement' => '6',
],
3 => [
'id' => '5',
'altunit' => NULL,
'measurement' => '6',
],
4 => [
'id' => '6',
'altunit' => NULL,
'measurement' => '6',
],
];
foreach($arr as $part) {
if (isset($part['altunit'])) { // ignore if blank
$key = (object) $part;
$set->attach($key); // attach the set
}
}
// Now you have...
foreach($set as $value) {
var_dump($value);
}
这会给你......
object(stdClass)#2 (3) {
["id"]=>
string(1) "2"
["altunit"]=>
string(1) "%"
["measurement"]=>
NULL
}
使用数组的第二种方法，其中数组键表示集合的序列化版本，看起来像这样......
$set = [];
$arr = [
0 => [
'id' => '2',
'altunit' => '%',
'measurement' => NULL,
],
1 => [
'id' => '3',
'altunit' => NULL,
'measurement' => '6',
],
2 => [
'id' => '4',
'altunit' => NULL,
'measurement' => '6',
],
3 => [
'id' => '5',
'altunit' => NULL,
'measurement' => '6',
],
4 => [
'id' => '6',
'altunit' => NULL,
'measurement' => '6',
],
];
foreach($arr as $part) {
if (isset($part['altunit'])) { // ignore if blank
$key = "{$part['altunit']}\0{$part['measurement']}";
$set[$key] = $part; // attach the set
}
}
// Now you have...
foreach($set as $value) {
var_dump($value);
}
这会给你......
array(3) {
["id"]=>
string(1) "2"
["altunit"]=>
string(1) "%"
["measurement"]=>
NULL
}
但是，如果这是SQL查询的结果集，则很可能通过修改查询以使用WHERE NOT NULL和GROUP BY子句来完全消除重复数据删除过程。
答案 5 :(得分：0)
You can try this also
<?php
$keys = array_map(function ($i) { return $i; }, $array);
$dumparr = array_combine($keys, $array);
$result = array_values($deduped);
print_r($result);
?>