Differences between unset and array_splice in PHP to delete elements in an array _ PHP Tutorial

Source: Internet
Author: User
In PHP, unset and array_splice are used to delete elements in the array. Differences between unset and array_splice in PHP to delete elements in an array php to delete an array element is very simple, however, sometimes to delete an array, you need to sort the index. we will use unset and array_splice to delete the elements in the array.

It is very simple to delete array elements in php. However, sometimes we need to sort indexes to delete arrays. we will use related functions. here we will introduce the use of unset, what is the difference between array_splice and deleting elements in an array?

If you want to delete an element from an array, you can use unset directly, but the index of the array will not be rearranged:

  

$ Arr = array ('A', 'B', 'C', 'D ');

Unset ($ arr [1]);

Print_r ($ arr );

?>

The result is:

Array ([0] => a [2] => c [3] => d)

So how can we fill in the missing elements and re-index the array? The answer is array_splice ():

  

$ Arr = array ('A', 'B', 'C', 'D ');

Array_splice ($ arr, 1, 1 );

Print_r ($ arr );

?>

The result is:

Array ([0] => a [1] => c [2] => d)

Delete special elements in an array

  

$ Arr2 = array (1, 3, 5, 7, 8 );

Foreach ($ arr2 as $ key => $ value)

{

If ($ value = 3)

Unset ($ arr2 [$ key]);

}

Var_dump ($ arr2 );

?>

Add or delete an empty array

Instance:

  

$ Array = ('a' => "abc", 'B' => "bcd", 'C' => "cde", 'D' => "def ", 'E' => "");

Array_filter ($ array );

Echo"

";

Print_r ($ array );

?>

Result:

Array (

[A] => abc

[B] => bcd

[C] => cde

[D] => def

)

Summary

If the array_splice () function is deleted, the index value of the array also changes.

If the unset () function is deleted, the index value of the array remains unchanged.

Deleting array elements in php is very simple, but sometimes we need to sort the index to delete the array...

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