php Removing Duplicate Data from Arrays

Don't talk nonsense, just go to the code

/**

         *  Rearrange an array 

         *  And array_unique Function: It requires val Is a string, and this can be an array / Object 

         *

         * @param unknown_type $arr  Array to be reloaded 

         * @param unknown_type $reserveKey  Do you want to keep the original Key

         * @return unknown

         */

        static function m_ArrayUnique($arr, $reserveKey = false)

        {

            if (is_array($arr) && !empty($arr))

            {

                foreach ($arr as $key => $value)

                {

                    $tmpArr[$key] = serialize($value) . '';

                }

                $tmpArr = array_unique($tmpArr);

                $arr = array();

                foreach ($tmpArr as $key => $value)

                {

                    if ($reserveKey)

                    {

                        $arr[$key] = unserialize($value);

                    }

                    else

                    {

                        $arr[] = unserialize($value);

                    }

                }

            }

            return $arr;

        }

The code is very simple, but it is very practical. Small partners who need it can use it directly.

Also attached is the solution of other netizens

<?php

$input = array("a" => "green","", "red","b" => "green", "","blue", "red","c" => "witer","hello","witer");

//$result = array_unique($input); // Remove duplicate elements 

$result = a_array_unique($input);   // Leave only a single 1 Element 

foreach($result as $aa)

{

echo $aa."<br />";

}

function multi_unique($array) {

   foreach ($array as $k=>$na)

       $new[$k] = serialize($na);

   $uniq = array_unique($new);

   foreach($uniq as $k=>$ser)

       $new1[$k] = unserialize($ser);

   return ($new1);

}
function a_array_unique($array)// It's better written 

{

   $out = array();

   foreach ($array as $key=>$value) {

       if (!in_array($value, $out))

{

           $out[$key] = $value;

       }

   }

   return $out;

} 

?>

The PHP array has a built-in function array_unique (), but the array_unique function of php is only applicable to 1-dimensional arrays and not to multidimensional arrays. Here is a array_unique function for 2-dimensional arrays

function unique_arr($array2D,$stkeep=false,$ndformat=true)

{

    //  Determine whether to keep it 1 Series array key  (1 Series array keys can be non-numeric )

    if($stkeep) $stArr = array_keys($array2D);

    //  Determine whether to keep it 2 Series array key  ( All 2 Series array keys must be the same )

    if($ndformat) $ndArr = array_keys(end($array2D));

    // Dimension reduction , You can also use implode, Will 1 Dimensional array is converted to a string concatenated with commas 

    foreach ($array2D as $v){

        $v = join(",",$v); 

        $temp[] = $v;

    }

    // Remove duplicate strings , That is, repeated 1 Dimensional array 

    $temp = array_unique($temp); 

    // Then reassemble the disassembled array 

    foreach ($temp as $k => $v)

    {

        if($stkeep) $k = $stArr[$k];

        if($ndformat)

        {

            $tempArr = explode(",",$v); 

            foreach($tempArr as $ndkey => $ndval) $output[$k][$ndArr[$ndkey]] = $ndval;

        }

        else $output[$k] = explode(",",$v); 

    }

    return $output;

}

Demo:

$array2D = array('first'= > array('title'= > '1111','date'= > '2222'),'second'= > array('title'= > '1111','date'= > '2222'),'third'= > array('title'= > '2222','date'= > '3333'));
print_r($array2D);
print_r(unique_arr($array2D,true));