将数组元素组合在一起

Question

I have an array in PHP:-

$arr = ["BX_NAME0","BX_NAME1","BX_NAME2","BX_categoryName0","BX_categoryName1","BX_categoryName2","BHA_categories0","BHA_categories1","BHA_categories2"] 

Here I want to group together elements based on same ending integer together in json like

$post_data = array(
      '0' => array(
        'BX_NAME0' => $item_type,
        'BX_categoryName0' => $string_key,
        'BHA_categories0' => $string_value
      ),
      '1' => array(
        'BX_NAME1' => $item_type,
        'BX_categoryName1' => $string_key,
        'BHA_categories1' => $string_value
      ),
);

I have Used:- filter_var($key , FILTER_SANITIZE_NUMBER_INT);

to get the integer part of the array elements but don't known how to group them further.

Answer 1

You can do it like below using preg_match():-

$new_array = array();

foreach ($arr as $ar){
   preg_match_all('!\d+!', $ar, $matches); //get the number from string
   $new_array[$matches[0][0]][$ar] = '';

}
echo "<pre/>";print_r($new_array);

Output:- https://eval.in/715548

Answer 2

It should be something like this:-

$arr = array("BX_NAME0","BX_NAME1","BX_NAME2","BX_categoryName0","BX_categoryName1","BX_categoryName2","BHA_categories0","BHA_categories1","BHA_categories2");

$post_data = array();

foreach($arr as $value) {
    $key = filter_var($value , FILTER_SANITIZE_NUMBER_INT);
    if(isset($post_data[$key]) && !is_array($post_data[$key])) {
         $post_data[$key] = array();
    }
    $post_data[$key][] = $value;
}

print_r($post_data);

Tested and works However, I suggest you use substr() to get the last character of the array item, for performance and stuff..

Answer 3

By using filter_var() method

$arr = ["BX_NAME0","BX_NAME1","BX_NAME2","BX_categoryName0","BX_categoryName1","BX_categoryName2","BHA_categories0","BHA_categories1","BHA_categories2"];
    foreach($arr as $a){
        $int = filter_var($a, FILTER_SANITIZE_NUMBER_INT);
        $newarr[$int][$a] = '';
    }
    print_r($newarr);

Output:- https://eval.in/715581