需要获取数组中的唯一值

Question

Array
(
)
Array
(
)
Array
(
    [0] => 14
)
Array
(
    [0] => 14
)
Array
(
    [0] => 14
)
Array
(
    [0] => 14
)
Array
(
    [0] => 14
)
Array
(
    [0] => 14
    [1] => 12
)

I want this array

Array
(
    [0] => 14
    [1] => 12
)

Here is my code:

$colorarray = array();
foreach($catIds as $catid){
    $colorarray[] = $catid;
}

Need to get unique array values

Thanks

Answer 1

You can use call_user_func_array with array-merge for flatten your array and then use array-unique as:

$res = call_user_func_array('array_merge', $arr);
print_r(array_unique($res)); // will give 12 and 14

Live example 3v4l

Or as @Progrock suggested: $output = array_unique(array_merge(...$data)); (I like that syntax using the ... )

Answer 2

You can always do something like this:

$colorarray = array();
foreach($catIds as $catid){
    if(!in_array($catid, $colorarray) {
       $colorarray[] = $catid;
    }
}

But also this has n*n complexity, So if your array is way too big, it might not be the most optimised solution for you.

Answer 3

You can do following to generate unique array.

array_unique($YOUR_ARRAY_VARIABLE, SORT_REGULAR);

this way only unique value is there in your array instead of duplication.

UPDATED

This is also one way to do same

<?php
 // define array 
 $a = array(1, 5, 2, 5, 1, 3, 2, 4, 5); 

 // print original array 
 echo "Original Array : \n"; 
 print_r($a); 

 // remove duplicate values by using  
 // flipping keys and values 
 $a = array_flip($a); 

 // restore the array elements by again  
 // flipping keys and values. 
 $a = array_flip($a); 

 // re-order the array keys 
 $a= array_values($a); 

 // print updated array 
 echo "\nUpdated Array : \n "; 
 print_r($a); 
?>

Reference link

Hope this will helps you

Answer 4

PHP: Removes duplicate values from an array

<?php
$fruits_list = array('Orange',  'Apple', ' Banana', 'Cherry', ' Banana');
$result = array_unique($fruits_list);
print_r($result);
?>

------your case--------

  $result = array_unique($catIds);
    print_r($result);

Answer 5

You can construct a new array of all values by looping through each sub-array of the original, and then filter the result with array_unique:

<?php
$data =
[
    [
        0=>13
    ],
    [
        0=>13
    ],
    [
        0=>17,
        1=>19
    ]
];

foreach($data as $array)
    foreach($array as $v)
        $all_values[] = $v;

var_export($all_values);
$unique = array_unique($all_values);
var_export($unique);

Output:

array (
    0 => 13,
    1 => 13,
    2 => 17,
    3 => 19,
  )array (
    0 => 13,
    2 => 17,
    3 => 19,
  )

Answer 6

I have updated your code please check

$colorarray = array();
foreach($catIds as $catid){
    $colorarray[$catid] = $catid;
}

This will give you 100% unique values.