How to delete the nth element of an array in php

In php, you can use array_splice() to delete the nth element of the array. This function can delete the specified number of elements starting from the specified position (subscript). You only need to set the second parameter to (n-1), the second parameter can be set to 1; the syntax is "array_splice($arr,n-1,1)".

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

In php, you can use array_splice () function to delete the nth element of the array.

array_splice() function can delete the specified number of elements starting from the specified position (subscript).

If you want to use the array_splice() function to delete the n-th element, you only need to set the second parameter to (n-1) and the second parameter to 1.

Example 1: Delete the 2nd element

<?php 
header("content-type:text/html;charset=utf-8");
$arr=array(1,2,3,4,5,6,7,8,9,10);
echo "原数组：";
var_dump($arr);
array_splice($arr,1,1);
echo "删除第2个元素：";
var_dump($arr);
?>

Example 2: Delete the 6th element

<?php 
header("content-type:text/html;charset=utf-8");
$arr=array(1,2,3,4,5,6,7,8,9,10);
echo "原数组：";
var_dump($arr);
array_splice($arr,5,1);
echo "删除第6个元素：";
var_dump($arr);
?>

Description: array_splice()

array_splice() is a powerful array function that can delete elements, add elements, and replace elements according to different parameter settings. Element operations.

array_splice() syntax is as follows:

array array_splice ( array &$arr, int $start [, int $length = 0 [, mixed $replacement ]] )

Parameter description:

• arr represents an array.
• start indicates the position (subscript) where deletion starts:
  •           If start is a positive number, delete from front to back.
  •             If start is a negative number, start from the position -start from the end of arr and delete it from the back to the front. For example -2 means start from the second to last element of the array.
• length is an optional parameter, indicating the number of elements to delete:
  •           If length is a positive number, it means deleting length elements;
  •           If length is a negative number, then all elements starting from start and counting down to length at the end of the array will be deleted;
  •                    If omitted, all elements starting at start and ending at the end of the array will be deleted.
• replacement is an optional parameter indicating the value to be replaced. If replacement has multiple values, it needs to be set to an array. If there is only one value, it does not need to be set to an array.

If the combination of start and length results in no element being deleted, then the value contained in replacement will be inserted into the position specified by start.

Note that using replacement to replace array elements will not retain the original key names.

Return value: Returns an array consisting of the deleted elements.

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