How to delete the first three elements of an array in php

Two methods for PHP to delete the first three elements of an array: 1. Use the array_slice() function to intercept all elements starting from the fourth element (after the third element). The syntax "array_slice($arr ,3)”. 2. Use the array_splice() function to intercept all elements starting from the fourth element (after the third element), the syntax is "array_splice($arr,3)".

The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer

php Two ways to delete the first three elements of the array

In PHP, you can use the array_slice() function or array_splice() function to delete the first three elements by intercepting the array.

Method 1. Use array_slice() function

array_slice() function can intercept the specified number (determined by $length parameter) starting from the specified position (determined by $start parameter) , can be omitted.) Elements

If you want to delete the first three elements of the array, just intercept all elements starting from the fourth element (after the third element); that is, set the parameter $start to 3 .

Example: intercept all elements starting from the fourth element

<?php
header("Content-type:text/html;charset=utf-8");
$arr = array(10,12,20,25,24,52,90,78);
echo "原数组：";
var_dump($arr); 

echo "删除数组前三个元素：";
$result = array_slice($arr,3); 
var_dump($result);
?>

##Method 2, use array_splice() function

When the array_splice() function deletes some elements of the array, it will form these deleted elements into a new array and then return the new array; therefore, the array_splice() function can be used to intercept array fragments.

Same as the array_slice() function, just set the second parameter $start of the function to 3.

<?php
header("Content-type:text/html;charset=utf-8");
$arr = array(10,12,20,25,24,52,90,78);
echo "原数组：";
var_dump($arr); 

echo "删除数组前三个元素：";
$result = array_splice($arr,3); 
var_dump($result);
?>

Description: The

array_slice() function is a function provided by PHP to intercept an array. It can extract a fragment from the array. The syntax is as follows:

array array_slice ( array $arr , int $start [, int $length = NULL [, bool $preserve_keys = false ]] )

Parameter description:

arr represents the array to be intercepted.
• start indicates the starting position (subscript) of interception:
• If start is a positive number, interception will be performed from front to back.
  • If start is a negative number, start from the position -start from the end of arr and intercept 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 intercepted length:
• If length is a positive number, it indicates the number of intercepted elements;
  • If length If it is a negative number, then the intercepted fragment will end at the length position from the end of the array;
  • If it is omitted, it will start from the start position and continue to the end of the array.
preserve_keys is an optional parameter that specifies whether to retain the original key name. The default is false, that is, not retained; if set to true, the original key name will be retained.

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