PHP deletes an array of elements specified in the subscript method PHP instance

The following small series for you to share a PHP delete array in the specified subscript element method, has a good reference value, I hope to be helpful to everyone. Let's take a look at it with a little knitting.

1, before the array as the stack and the queue to delete the element operation, that is, in order to delete the regular. So, what if you need to remove an element from the middle of the array? You need the unset () function We're going to talk about today.

2, the unset () function allows you to cancel an element in an array, but the array does not rebuild the index, that is, keep the original index, because the index in PHP has a special meaning.

3. Example shows:

<?php   $arr = Array (1=> ' one ',2=> ', ',3=> ' three ');       Delete the element labeled 2   unset ($arr [2]);//will get Array (1=> ' one ',3=> ' three ')    //Use Array_values () to re-index   $aar = Array_values ($arr); $aar = Array (0=> ' one ',1=> ' three ')?>

4, the last sentence in the above example code to re-establish the array index, here I explain the following: Because after using the unset () function to delete an element, and did not re-establish index subscript order. If you need a sequential index subscript, you can use the Array_values () function to recreate the index subscript order.

Note: The re-indexing of the premises refers to the re-establishment of an index starting at 0, even if your index is not numerically named, and is re-indexed.

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