How to intercept the last few digits of an array in php

php method to intercept the last few elements of the array: 1. Use the "array_slice($array,$start)" statement, and the parameter "$start" must be a negative value; 2. Use "array_splice($array, $start)" statement, the parameter "$start" must be a negative value.

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

After php intercepts the array How many elements

1. Use array_slice() function

array_slice() function is a function provided by PHP to intercept arrays. A fragment can be extracted from an 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.

Example: intercept the last few elements of the array

If you want to intercept the last few elements of the array, just set the parameter start to a negative value

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

echo "截取数组后2位的元素片段：";
$result = array_slice($arr,-2); //截取数组后2位的元素
var_dump($result);


?>

Output result

2. Use the array_splice() function

array_splice() function to delete the array When a part of the elements is removed, these deleted elements will be formed into a new array, and then the new array will be returned; therefore, the array_splice() function can be used to intercept array fragments.

Same as the array_slice() function, you only need to set the second parameter start of the function to a negative value to intercept the last few elements of the array.

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

echo "截取数组后3位的元素片段：";
$result = array_splice($arr,-3); //截取数组后3位的元素
var_dump($result);


?>

Output results

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