How to get the last set of values ​​from an array in php

In PHP applications, arrays are a very commonly used data type that can be used to save a set of values ​​and access the corresponding values ​​through keys. Sometimes, we need to get the last set of values ​​from an array. This article will introduce several methods to get the last set of values ​​of an array in PHP.

Method 1: Use the end() function

The end() function is a built-in function in PHP that can return the value of the last element of the array. The usage is very simple, just pass the array to the end() function. The following is a sample code:

$arr = array('a' => 1, 'b' => 2, 'c' => 3);
echo end($arr); // 输出 3

It should be noted that after using the end() function, the internal pointer of the array points to the last element. If you need to traverse the entire array, you need to use the reset() function to reset the pointer.

Method 2: Use the array_pop() function

The array_pop() function is another built-in function in PHP that is used to delete the last element in the array and return its value. If you only need to get the value of the last element, you can make a copy of the original array before calling the array_pop() function. The following is a sample code:

$arr = array('a' => 1, 'b' => 2, 'c' => 3);
$last_value = array_pop($arr);
echo $last_value; // 输出 3

It should be noted that after using the array_pop() function, the last element in the original array is deleted.

Method 3: Use the count() function

The count() function is a function used in PHP to obtain the length of an array. Before getting the last element of the array, you can first use the count() function to get the length of the array, and then get the value of the last element through the index. The following is a sample code:

$arr = array('a' => 1, 'b' => 2, 'c' => 3);
$last_key = count($arr) - 1;
$last_value = $arr[$last_key];
echo $last_value; // 输出 3

It should be noted that when using the count() function to obtain the array length, you need to subtract 1. Because the index of array elements starts from 0.

Method 4: Use the array_slice() function

The array_slice() function is a function in PHP used to intercept arrays. By specifying parameters, you can intercept part of the array and return a new array. If you only need to get the last element, you can use the array_slice() function to intercept the last element and return it. The following is a sample code:

$arr = array('a' => 1, 'b' => 2, 'c' => 3);
$last_value = array_slice($arr, -1, 1)[0];
echo $last_value; // 输出 3

It should be noted that when using the array_slice() function, the first parameter is the original array, the second parameter is the starting position of the interception, and the third parameter is the interception length. If a negative number is used as the second parameter, it means intercepting from the end of the array.

Summary

This article introduces four methods to get the last set of values ​​of an array in PHP. Using these methods, you can flexibly obtain the last element of the array according to specific needs. Whether you use built-in functions or manually iterate over the array, you can achieve the same goal.

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