Two dimensional array de duplication in PHP

Preface

Sometimes in the database join When associating and querying data, some duplicate data will be found, which requires manual de duplication , Avoid returning to the list with duplicate data .

/** * 1. Delete the data of the same item in the two-dimensional array , It is generally used for de duplication of the same records in the database query results  * 2. Reset the index of the two-dimensional array  * @param array $_2d_array  Two dimensional array , similar ： * $tmpArr = array( * array('id' => 1, 'value' => '15046f5de5bb708e'), * array('id' => 1, 'value' => '15046f5de5bb708e'), * ); * @param string $unique_key  Representing the above array  "id"  key , perhaps  "value"  key  * @return mixed */
    function unique_2d_array_by_key($_2d_array, $unique_key)
    {
    
        $tmp_key[] = array();
        foreach ($_2d_array as $key => &$item) {
    
            if (is_array($item) && isset($item[$unique_key])) {
    
                if (in_array($item[$unique_key], $tmp_key)) {
    
                    unset($_2d_array[$key]);
                } else {
    
                    $tmp_key[] = $item[$unique_key];
                }
            }
        }
        // Reset the index of the two-dimensional array 
        return array_slice($_2d_array, 0, count($_2d_array), false);
    }