How to delete the last number in an array in php

In PHP programming, arrays are a very important basic data type. If you need to remove the last element from an array in PHP code, then you can do it using some of the array functions built in PHP.

Using the array_pop() function in PHP can easily pop (delete) the last element from the array. This function will return the deleted element to the caller, and at the same time, the last element of the original array will also be deleted. Let's look at a simple example:

$fruits = array("apple", "banana", "cherry");
$last_fruit = array_pop($fruits);
echo $last_fruit; // 输出 "cherry"
print_r($fruits); // 输出 Array ( [0] => apple [1] => banana )

In the above code, we first define an array $fruits, which contains three elements "apple", "banana" and "cherry" ". Then we called the array_pop() function to delete the last element "cherry" in the array and assigned the deleted element to the variable $last_fruit. Finally, we used the echo and print_r functions to output the values ​​of the $last_fruit and $fruits variables respectively.

In addition to the array_pop() function, there are some other array functions in PHP that can be used to delete elements in the array. Among them, the array_splice() function can delete elements at the specified position, the array_shift() function can delete the first element in the array, and the unset() function can delete the specified element.

Let's take a look at how to use the array_splice() function to delete the last element from the array:

$fruits = array("apple", "banana", "cherry");
array_splice($fruits, -1);
print_r($fruits); // 输出 Array ( [0] => apple [1] => banana )

In the above code, we called the array_splice() function and changed the array$fruits and a negative index -1 are passed to the function as arguments. This negative index means counting from the end of the array, -1 means the last element in the array, so the array_splice() function actually deletes the last element of the array. Finally, we use the print_r function to output the deleted array $fruits.

Although the unset() function can delete the specified element, it should be noted that this function will not rebuild the index of the array, which means that after deleting an element, the index of the array may become chaotic. The following is an example of using the unset() function to delete the last element of an array:

$fruits = array("apple", "banana", "cherry");
unset($fruits[count($fruits)-1]);
print_r($fruits); // 输出 Array ( [0] => apple [1] => banana )

In the above code, we called the count() function to get the length of the array $fruits, and then use The subtraction operator -1 gets the index of the last element of the array. Finally, we use the unset() function to delete the last element in the array, and then use the print_r function to output the deleted array $fruits.

To sum up, using the array_pop() function is the simplest and most common way to delete the last element in an array, and it is also the most suitable method in most cases. In addition, you can also choose other array functions to delete elements in the array according to your needs.

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