我尝试了很多解决方案，但没有一个适合我的情况。例如，我有3个数组(它们的数量可以从1到4不等)，我想从多维数组
中删除所有重复的值例子 Array
(
[33] => Array
(
[product_id] => 33
[name] => Aliquam dolor tellus Aliquam dolor tellus
[color] => Brown
[breat] => 3
[shorten] => Yes
[material] => Natural
[rigidity] => Low
)
[54] => Array
(
[product_id] => 54
[name] => New Style
[color] => Black
[breat] => 4
[shorten] => Yes
[material] => Natural
[rigidity] => Low
)
[23] => Array
(
[product_id] => 23
[name] => New Natural
[color] => Yellow
[breat] => 5
[shorten] => No
[material] => Natural
[rigidity] => Low
)
)
这是想要的数组
Array
(
[33] => Array
(
[product_id] => 33
[name] => Aliquam dolor tellus Aliquam dolor tellus
[color] => Brown
[breat] => 3
[shorten] => Yes
[material] =>
[rigidity] =>
)
[54] => Array
(
[product_id] => 54
[name] => New Style
[color] => Black
[breat] => 4
[shorten] => Yes
[material] =>
[rigidity] =>
)
[23] => Array
(
[product_id] => 23
[name] => New Natural
[color] => Yellow
[breat] => 5
[shorten] => No
[material] =>
[rigidity] =>
)
)
您可以使用下面注释代码中提供的逻辑来删除键，其值在所有子数组中完全相同。然而，下面的代码只关注3个键，即:material, rigidity和shorten。如果您想对所有的键都这样做，您可以简单地修改代码，以达到这种效果。
注:所有所谓的duplicate are Deleted…它们没有被赋值为NULL，因为这样做没有多大意义，但是如果你愿意，你也可以给它们赋值为NULL。
$arr = [
33 =>[
'product_id'=> 33,
'name' => 'Aliquam dolor tellus Aliquam dolor tellus',
'color' => 'Brown',
'breat' => 3,
'shorten' => 'Yes',
'material' => 'Natural',
'rigidity' => 'Low',
],
54 =>[
'product_id'=> 54,
'name' => 'New Style',
'color' => 'Black',
'breat' => 4,
'shorten' => 'Yes',
'material' => 'Natural',
'rigidity' => 'Low',
],
23 =>[
'product_id'=> 23,
'name' => 'New Natural',
'color' => 'Yellow',
'breat' => 5,
'shorten' => 'No',
'material' => 'Natural',
'rigidity' => 'Low',
],
];
// CREATE TEMPORAL ARRAYS TO HOLD SCALAR VALUES CORRESPONDING TO
// THE KEYS WHOSE DUPLICITY YOU WISH TO CHECK.
// YOU CAN DO THIS FOR ALL THE KEYS IF YOU CHOOSE
// HERE WE LIMIT THOSE TO THE 3 KEYS BELOW:
$material = $rigidity = $shorten = [];
// LOOP THROUGH YOUR ARRAY AND BUNDLE THE VALUES FOR THE
// `rigidity`, `shorten` & `material` KEYS INTO UNIQUE ARRAYS
// TO BE USED LATER FOR FURTHER PROCESSING *YOUR* DUPLICATES
foreach($arr as $pid=>$data){
// ADD THE VALUES OF THE `rigidity`, `shorten` AND `material` KEYS
// TO THE $rigidity, $shorten AND $material ARRAY RESPECTIVELY:
$material[] = $data['material'];
$rigidity[] = $data['rigidity'];
$shorten[] = $data['shorten'];
}
// EXTRACT THE UNIQUE VALUES OF THE $material, $shorten AND $rigidity ARRAYS
// THE LENGTHS OF WHICH WE SHALL USE TO DETERMINE IF THEY ARE SAME OR NOT
// IF THE LENGTH IS 1; THEN THEY ARE THE SAME ACROSS ALL SUB-ARRAY
// AND THUS ARE FIT TO BE DELETED...
$material = array_unique($material);
$rigidity = array_unique($rigidity);
$shorten = array_unique($shorten);
// LOOP AGAIN THROUGH YOUR ARRAY BUT THIS TIME
// ONLY TO DELETE THE KEYS THAT ARE THE SAME ACROSS ALL SUB-ARRAY
foreach($arr as $pid=>&$data){
if(count($rigidity) == 1){
unset($data['rigidity']);
}
if(count($material) == 1){
unset($data['material']);
}
if(count($shorten) == 1){
unset($data['shorten']);
}
}
// CHECK OUT THE CURRENT VALUE OF THE ARRAY YOU STARTED WITH
var_dump($arr);
var_dump (arr)美元以上收益率:
array (size=3)
33 =>
array (size=5)
'product_id' => int 33
'name' => string 'Aliquam dolor tellus Aliquam dolor tellus' (length=41)
'color' => string 'Brown' (length=5)
'breat' => int 3
'shorten' => string 'Yes' (length=3)
54 =>
array (size=5)
'product_id' => int 54
'name' => string 'New Style' (length=9)
'color' => string 'Black' (length=5)
'breat' => int 4
'shorten' => string 'Yes' (length=3)
23 =>
array (size=5)
'product_id' => int 23
'name' => string 'New Natural' (length=11)
'color' => string 'Yellow' (length=6)
'breat' => int 5
'shorten' => string 'No' (length=2)
可以使用多个数组。但是你需要循环两次。像这样…
$array = //your array here
//hold the duplicates and values that exist to a name
$dupes = $exists = Array();
//get the duplicates
foreach($array as $nextArray)
{
foreach($nextArray as $key => $val)
{
if(!isset($counts[$key]))
$counts[$key] = Array($val);
else {
//since the key already exists check to see if the value exists
if(in_array($val,$counts[$key])) {
if(!isset($dupes[$key]))
$dupes[$key] = array($val);
}
else {
$counts[$key][] = $val;
}
}
}
}
//apply the duplicates to the array
foreach($array as $arrKey => $nextArray)
{
foreach($nextArray as $key => $val)
{
//if a dupe exist then make the value an empty string
if(isset($dupes[$key]) && in_array($val,$dupes[$key]))
$array[$arrKey][$key] = '';
}
}