How to remove multiple elements from php array

In PHP, array_splice() can be used to remove multiple array elements. This function can delete a specified number of elements starting from a specified position. The syntax is "array_splice(array, starting position, number of deleted)". If the second parameter is a positive array, it will be deleted from front to back; if it is a negative number, it will be deleted from the reciprocal position.

The operating environment of this tutorial: Windows 7 system, PHP 8.1 version, Dell G3 computer.

In php, you can use the array_splice() function to remove multiple array elements.

array_splice() function can delete the specified number of elements starting from the specified position. This function changes the original array. Grammar:

array_splice(array,start,length)

• 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.

If start is a positive number, you need to specify the number of deleted elements length; if start is a negative number, count down from Delete the specified number of elements starting from the position.

Example 1: Remove 2 elements from the beginning

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

echo "从开头删除2个元素";
array_splice($arr,0,2); 
var_dump($arr); 
?>

Example 2: Remove 2 from the middle elements

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

echo "从中间删除2个元素";
array_splice($arr,2,2); 
var_dump($arr); 
?>

Example 3: Remove 2 elements from the end

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

echo "从末尾删除2个元素";
array_splice($arr,-2); 
var_dump($arr); 
?>

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