Several small way to rebuild PHP array index

The PHP array is actually an ordered map. A mapping to values associated keys type. This type is optimized in many ways, so you can use it as a real array, or list (vector), hash table (an implementation is mapped), dictionary, collection, stack, queue and probably more. Since the array element can also be another array, multi-dimensional arrays, and the tree structure are allowed.

Types of

1. Indexed array, from array from 0,1
2. Associative array, i.e. custom key

Reconstruction

1. array_column(arr,key,index);

   In the key pass NUll, which can rebuild a new array is an indexed array

   $a = array(
       'a' => 'baidu',
       'b' => 'qq',
       'c' => 'nho',
   );
   print_r(array_column($a,null)); //echo array('baidu','qq','nho')

2. array_merge($arr1,$arr2);

   Method can be used not only key index of the array starts at 0, to the associated index is not valid, only passing a current index of the array, it will be the current array index rebuild

   $b = [
           1=>'baidu',
           '1123',
           'nho',
       ];
   print_r(array_merge($b));    //echo array('baidu','1123','nho')

3. array_splice($arr,$start,$length,$replacement);

   This method returns the specified segment array, $ replacement will be set to true numerical index rebuild

   $b = array(
       '1' => 'baidu',
       '2' => 'qq',
       '3' => 'nho',
       '4' => 'vv'
   );
   $count = count($b);
   print_r(array_splice($b,0,$count,true)); //echo array('baidu','qq','nho','vv')