How to remove the last number from an array in php

Removing the last number from an array in PHP is a very common problem. Sometimes we need to do this to avoid unnecessary problems. This article will introduce several methods to remove the last number of an array in PHP.

Method 1: array_pop function

The array_pop function can remove the last element in the array and return the removed element. Here is an example:

$array = array(1, 2, 3, 4, 5);
$last_element = array_pop($array);
print_r($array);

Output:

Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 )

In the above example, we have defined an array with 5 elements. Then we call the array_pop function, which returns the last element in the array and removes it from the array. Finally, we print out the removed array.

Method 2: array_slice function

Another function that can be used to remove the last element of an array is array_slice. This function returns a new array containing a portion of the array. Here is an example:

$array = array(1, 2, 3, 4, 5);
$new_array = array_slice($array, 0, -1);
print_r($new_array);

Output:

Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 )

In the above example, we use the array_slice function to copy all the elements from the original array into a new array. This new array is all the elements in the original array except the last element. We pass two parameters to the array_slice function, the first parameter is the original array, the second parameter is the starting index to be copied, and the last parameter is the ending index to be copied. Here we use -1, which means that the end index is the second to last element in the array.

Method three: unset function

The last method is to use the unset function to delete the last element in the array. This function directly changes the original array. Below is the sample code:

$array = array(1, 2, 3, 4, 5);
unset($array[count($array)-1]);
print_r($array);

Output:

Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 )

In the above example, we have removed the last element using the unset function. We do this by calculating the length of the array and then deleting the element whose index is the array length minus 1.

Summary

These three methods can be used to remove the last element from the array. Which method to use depends on your preference and specific needs. If you just need to delete the last element and don't need to generate a new array, then using unset is the easiest way. If you need a new array, it's better to use array_slice.

When writing code, we should give priority to built-in functions because they have been tested and are much faster than functions written by ourselves.

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