How to Reindex a PHP Array: What is the Best Way to Fill in Missing Indexes?

Reindexing an Array in PHP: Resolving Missing Indexes

You have an array where certain indexes have been unset, resulting in gaps in the index sequence. To address this, you seek to reindex the array to ensure consecutive index numbers from 0 to [n].

Solution: Utilizing array_values() Function

PHP provides the array_values() function, which takes an array as input and returns a new array with sequential integer indexes starting from 0. This process effectively removes any existing gaps in index numbers. By assigning the result of array_values() to your original array, you can reindex it.

Example:

Consider the following array with missing indexes:

<code class="php">$myarray = [
    0 => 'a->1',
    1 => 'a->7 b->3',
    3 => 'a->8 b->6',
    4 => 'a->3 b->2'
];</code>

To reindex this array, use the following code:

<code class="php">$myarray = array_values($myarray);</code>

This will result in the following reindexed array:

<code class="php">[
    0 => 'a->1',
    1 => 'a->7 b->3',
    2 => 'a->8 b->6',
    3 => 'a->3 b->2'
]</code>

As you can see, the missing index [2] is now occupied, and the indexes are now sequential from 0 to 3.

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