How to delete array elements in batches in php

In PHP, you can use the array_splice() function to delete array elements in batches. This function can delete a specified number of elements starting from a specified position in the array. The syntax is "array_splice($array,$start,$length)" .

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

PHP array_splice() function is used to delete arrays Part of the element; you can delete it directly or replace it with another value.

array_splice() syntax is as follows:

array_splice($array,$start,$length,$replacement)

Parameter description:

• array represents an array.
• start indicates the position (subscript) where deletion begins:
  • 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 from back to 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 be deleted:
  • If length is a positive number, it means length elements are deleted;
  • If length is a negative number, all elements starting from start and counting down to length from the end of the array will be deleted;
  • If it is omitted, all elements starting from 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 result of the combination of start and length is that no elements will be 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.

Example:

<?php
header("Content-type:text/html;charset=utf-8");
$arr=array(10,12,20,25,24);
echo "原数组：";
var_dump($arr);

echo "删除后的数组：" ;
array_splice($arr,2);
var_dump($arr);
?>

<?php
header("Content-type:text/html;charset=utf-8");
$arr=array(10,12,20,25,24);
echo "原数组：";
var_dump($arr);

echo "删除后的数组：" ;
array_splice($arr,2,-1);
var_dump($arr);
?>

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